18861325 has 36 divisors (see below), whose sum is σ = 27671220. Its totient is φ = 12714240.

The previous prime is 18861307. The next prime is 18861331. The reversal of 18861325 is 52316881.

It can be written as a sum of positive squares in 6 ways, for example, as 86436 + 18774889 = 294^2 + 4333^2 .

It is not a de Polignac number, because 18861325 - 2⁷ = 18861197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 108939 + ... + 109111.

It is an arithmetic number, because the mean of its divisors is an integer number (768645).

Almost surely, 2^18861325 is an apocalyptic number.

It is an amenable number.

18861325 is a deficient number, since it is larger than the sum of its proper divisors (8809895).

18861325 is a wasteful number, since it uses less digits than its factorization.

18861325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 274 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 18861325 is about 4342.9626984353. The cubic root of 18861325 is about 266.1893849831.

The spelling of 18861325 in words is "eighteen million, eight hundred sixty-one thousand, three hundred twenty-five".