15915725 has 12 divisors (see below), whose sum is σ = 22555104. Its totient is φ = 10913520.

The previous prime is 15915721. The next prime is 15915763. The reversal of 15915725 is 52751951.

It is not a de Polignac number, because 15915725 - 2² = 15915721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15915721) 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, 45299 + ... + 45648.

It is an arithmetic number, because the mean of its divisors is an integer number (1879592).

Almost surely, 2^15915725 is an apocalyptic number.

It is an amenable number.

15915725 is a deficient number, since it is larger than the sum of its proper divisors (6639379).

15915725 is an equidigital number, since it uses as much as digits as its factorization.

15915725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90964 (or 90959 counting only the distinct ones).

The product of its digits is 15750, while the sum is 35.

The square root of 15915725 is about 3989.4517167150. The cubic root of 15915725 is about 251.5410149083.

The spelling of 15915725 in words is "fifteen million, nine hundred fifteen thousand, seven hundred twenty-five".