15996225 has 24 divisors (see below), whose sum is σ = 30226240. Its totient is φ = 7312320.

The previous prime is 15996223. The next prime is 15996241. The reversal of 15996225 is 52269951.

It is not a de Polignac number, because 15996225 - 2¹ = 15996223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15996221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14710 + ... + 15759.

Almost surely, 2^15996225 is an apocalyptic number.

15996225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15996225 is a deficient number, since it is larger than the sum of its proper divisors (14230015).

15996225 is a wasteful number, since it uses less digits than its factorization.

15996225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30489 (or 30484 counting only the distinct ones).

The product of its digits is 48600, while the sum is 39.

The square root of 15996225 is about 3999.5280971635. The cubic root of 15996225 is about 251.9643909120.

The spelling of 15996225 in words is "fifteen million, nine hundred ninety-six thousand, two hundred twenty-five".