15249725 has 6 divisors (see below), whose sum is σ = 18909690. Its totient is φ = 12199760.

The previous prime is 15249721. The next prime is 15249727. The reversal of 15249725 is 52794251.

It can be written as a sum of positive squares in 3 ways, for example, as 47524 + 15202201 = 218^2 + 3899^2 .

It is not a de Polignac number, because 15249725 - 2² = 15249721 is a prime.

It is a super-2 number, since 2×15249725² = 465108225151250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15249721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 304970 + ... + 305019.

It is an arithmetic number, because the mean of its divisors is an integer number (3151615).

Almost surely, 2^15249725 is an apocalyptic number.

It is an amenable number.

15249725 is a deficient number, since it is larger than the sum of its proper divisors (3659965).

15249725 is an equidigital number, since it uses as much as digits as its factorization.

15249725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609999 (or 609994 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 15249725 is about 3905.0896276526. The cubic root of 15249725 is about 247.9822925703.

The spelling of 15249725 in words is "fifteen million, two hundred forty-nine thousand, seven hundred twenty-five".