18115825 has 24 divisors (see below), whose sum is σ = 27651008. Its totient is φ = 11465280.

The previous prime is 18115813. The next prime is 18115831. The reversal of 18115825 is 52851181.

It is not a de Polignac number, because 18115825 - 2⁹ = 18115313 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1707 + ... + 6256.

Almost surely, 2^18115825 is an apocalyptic number.

It is an amenable number.

18115825 is a deficient number, since it is larger than the sum of its proper divisors (9535183).

18115825 is a wasteful number, since it uses less digits than its factorization.

18115825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7993 (or 7988 counting only the distinct ones).

The product of its digits is 3200, while the sum is 31.

The square root of 18115825 is about 4256.2689059786. The cubic root of 18115825 is about 262.6350627701.

The spelling of 18115825 in words is "eighteen million, one hundred fifteen thousand, eight hundred twenty-five".