15997925 has 12 divisors (see below), whose sum is σ = 20135616. Its totient is φ = 12606000.

The previous prime is 15997889. The next prime is 15997957. The reversal of 15997925 is 52979951.

It is not a de Polignac number, because 15997925 - 2¹⁴ = 15981541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15997925.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3101 + ... + 6450.

It is an arithmetic number, because the mean of its divisors is an integer number (1677968).

Almost surely, 2^15997925 is an apocalyptic number.

It is an amenable number.

15997925 is a deficient number, since it is larger than the sum of its proper divisors (4137691).

15997925 is an equidigital number, since it uses as much as digits as its factorization.

15997925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9628 (or 9623 counting only the distinct ones).

The product of its digits is 255150, while the sum is 47.

The square root of 15997925 is about 3999.7406165900. The cubic root of 15997925 is about 251.9733164406.

The spelling of 15997925 in words is "fifteen million, nine hundred ninety-seven thousand, nine hundred twenty-five".