18056978 has 8 divisors (see below), whose sum is σ = 28263168. Its totient is φ = 8635924.

The previous prime is 18056959. The next prime is 18056981. The reversal of 18056978 is 87965081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196226 + ... + 196317.

It is an arithmetic number, because the mean of its divisors is an integer number (3532896).

Almost surely, 2^18056978 is an apocalyptic number.

18056978 is a deficient number, since it is larger than the sum of its proper divisors (10206190).

18056978 is a wasteful number, since it uses less digits than its factorization.

18056978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392568.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 18056978 is about 4249.3503032817. The cubic root of 18056978 is about 262.3503751988.

The spelling of 18056978 in words is "eighteen million, fifty-six thousand, nine hundred seventy-eight".