Question

Write the number in two other forms 15,409

Answer 1

There are several other was to write this number:

In words: Fifteen Thousand, Four Hundred and Nine.
In scientific notation: $1.54\times10^{4}$
In binary: 0b11110000110001
In hexadecimal: 0x3C31
In prime factorization: $15,409=19\times811$