18712825 has 6 divisors (see below), whose sum is σ = 23203934. Its totient is φ = 14970240.

The previous prime is 18712817. The next prime is 18712849. The reversal of 18712825 is 52821781.

It can be written as a sum of positive squares in 3 ways, for example, as 769129 + 17943696 = 877^2 + 4236^2 .

It is not a de Polignac number, because 18712825 - 2³ = 18712817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 374232 + ... + 374281.

Almost surely, 2^18712825 is an apocalyptic number.

It is an amenable number.

18712825 is a deficient number, since it is larger than the sum of its proper divisors (4491109).

18712825 is an equidigital number, since it uses as much as digits as its factorization.

18712825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748523 (or 748518 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 18712825 is about 4325.8322898605. The cubic root of 18712825 is about 265.4889513220.

The spelling of 18712825 in words is "eighteen million, seven hundred twelve thousand, eight hundred twenty-five".