15980725 has 12 divisors (see below), whose sum is σ = 20015460. Its totient is φ = 12656000.

The previous prime is 15980677. The next prime is 15980743. The reversal of 15980725 is 52708951.

It can be written as a sum of positive squares in 6 ways, for example, as 1304164 + 14676561 = 1142^2 + 3831^2 .

It is not a de Polignac number, because 15980725 - 2⁹ = 15980213 is a prime.

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, 640 + ... + 5689.

It is an arithmetic number, because the mean of its divisors is an integer number (1667955).

Almost surely, 2^15980725 is an apocalyptic number.

It is an amenable number.

15980725 is a deficient number, since it is larger than the sum of its proper divisors (4034735).

15980725 is a wasteful number, since it uses less digits than its factorization.

15980725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6440 (or 6435 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 15980725 is about 3997.5898989266. The cubic root of 15980725 is about 251.8829819094.

The spelling of 15980725 in words is "fifteen million, nine hundred eighty thousand, seven hundred twenty-five".