15120725 has 6 divisors (see below), whose sum is σ = 18749730. Its totient is φ = 12096560.

The previous prime is 15120673. The next prime is 15120727. The reversal of 15120725 is 52702151.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 58564 + 15062161 = 242^2 + 3881^2 .

It is not a de Polignac number, because 15120725 - 2⁶ = 15120661 is a prime.

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 15120725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15120727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 302390 + ... + 302439.

It is an arithmetic number, because the mean of its divisors is an integer number (3124955).

Almost surely, 2^15120725 is an apocalyptic number.

It is an amenable number.

15120725 is a deficient number, since it is larger than the sum of its proper divisors (3629005).

15120725 is an equidigital number, since it uses as much as digits as its factorization.

15120725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604839 (or 604834 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 15120725 is about 3888.5376428678. The cubic root of 15120725 is about 247.2810702161.

Adding to 15120725 its reverse (52702151), we get a palindrome (67822876).

The spelling of 15120725 in words is "fifteen million, one hundred twenty thousand, seven hundred twenty-five".