18390825 has 18 divisors (see below), whose sum is σ = 32940414. Its totient is φ = 9808320.

The previous prime is 18390793. The next prime is 18390833. The reversal of 18390825 is 52809381.

It can be written as a sum of positive squares in 3 ways, for example, as 166464 + 18224361 = 408^2 + 4269^2 .

It is not a de Polignac number, because 18390825 - 2⁵ = 18390793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18390825.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40644 + ... + 41093.

It is an arithmetic number, because the mean of its divisors is an integer number (1830023).

Almost surely, 2^18390825 is an apocalyptic number.

18390825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18390825 is a deficient number, since it is larger than the sum of its proper divisors (14549589).

18390825 is a wasteful number, since it uses less digits than its factorization.

18390825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81753 (or 81745 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 18390825 is about 4288.4525181002. The cubic root of 18390825 is about 263.9573364253.

The spelling of 18390825 in words is "eighteen million, three hundred ninety thousand, eight hundred twenty-five".