13815625 has 12 divisors (see below), whose sum is σ = 17272332. Its totient is φ = 11050000.

The previous prime is 13815623. The next prime is 13815643. The reversal of 13815625 is 52651831.

It can be written as a sum of positive squares in 6 ways, for example, as 9265936 + 4549689 = 3044^2 + 2133^2 .

It is not a de Polignac number, because 13815625 - 2¹ = 13815623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13815623) 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 11 ways as a sum of consecutive naturals, for example, 915 + ... + 5335.

It is an arithmetic number, because the mean of its divisors is an integer number (1439361).

Almost surely, 2^13815625 is an apocalyptic number.

It is an amenable number.

13815625 is a deficient number, since it is larger than the sum of its proper divisors (3456707).

13815625 is an frugal number, since it uses more digits than its factorization.

13815625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446 (or 4426 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 13815625 is about 3716.9375835491. The cubic root of 13815625 is about 239.9515237740.

The spelling of 13815625 in words is "thirteen million, eight hundred fifteen thousand, six hundred twenty-five".