18525978 has 24 divisors (see below), whose sum is σ = 40386528. Its totient is φ = 6137352.

The previous prime is 18525961. The next prime is 18525989. The reversal of 18525978 is 87952581.

It is a happy number.

18525978 is a `hidden beast` number, since 1 + 8 + 52 + 597 + 8 = 666.

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 11 ways as a sum of consecutive naturals, for example, 76 + ... + 6087.

It is an arithmetic number, because the mean of its divisors is an integer number (1682772).

Almost surely, 2^18525978 is an apocalyptic number.

18525978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18525978 is an abundant number, since it is smaller than the sum of its proper divisors (21860550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18525978 is a wasteful number, since it uses less digits than its factorization.

18525978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6338 (or 6335 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 18525978 is about 4304.1814552828. The cubic root of 18525978 is about 264.6023607922.

It can be divided in two parts, 18525 and 978, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 18525978 in words is "eighteen million, five hundred twenty-five thousand, nine hundred seventy-eight".