15855225 has 12 divisors (see below), whose sum is σ = 26214096. Its totient is φ = 8456080.

The previous prime is 15855209. The next prime is 15855227. The reversal of 15855225 is 52255851.

It is not a de Polignac number, because 15855225 - 2⁴ = 15855209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15855227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105627 + ... + 105776.

It is an arithmetic number, because the mean of its divisors is an integer number (2184508).

Almost surely, 2^15855225 is an apocalyptic number.

15855225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15855225 is a deficient number, since it is larger than the sum of its proper divisors (10358871).

15855225 is a wasteful number, since it uses less digits than its factorization.

15855225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211416 (or 211411 counting only the distinct ones).

The product of its digits is 20000, while the sum is 33.

The square root of 15855225 is about 3981.8620016269. The cubic root of 15855225 is about 251.2218849261.

The spelling of 15855225 in words is "fifteen million, eight hundred fifty-five thousand, two hundred twenty-five".