15920125 has 32 divisors (see below), whose sum is σ = 21831264. Its totient is φ = 11520000.

The previous prime is 15920123. The next prime is 15920129. The reversal of 15920125 is 52102951.

It can be written as a sum of positive squares in 16 ways, for example, as 10169721 + 5750404 = 3189^2 + 2398^2 .

It is not a de Polignac number, because 15920125 - 2¹ = 15920123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 15920125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15920123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157575 + ... + 157675.

It is an arithmetic number, because the mean of its divisors is an integer number (682227).

Almost surely, 2^15920125 is an apocalyptic number.

It is an amenable number.

15920125 is a deficient number, since it is larger than the sum of its proper divisors (5911139).

15920125 is a wasteful number, since it uses less digits than its factorization.

15920125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 15920125 is about 3990.0031328309. The cubic root of 15920125 is about 251.5641927924.

Subtracting from 15920125 its sum of digits (25), we obtain a square (15920100 = 3990²).

It can be divided in two parts, 159201 and 25, that multiplied together give a square (3980025 = 1995²).

The spelling of 15920125 in words is "fifteen million, nine hundred twenty thousand, one hundred twenty-five".