18989274 has 16 divisors (see below), whose sum is σ = 38546208. Its totient is φ = 6235152.

The previous prime is 18989249. The next prime is 18989291. The reversal of 18989274 is 47298981.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23217 + ... + 24020.

It is an arithmetic number, because the mean of its divisors is an integer number (2409138).

Almost surely, 2^18989274 is an apocalyptic number.

18989274 is an abundant number, since it is smaller than the sum of its proper divisors (19556934).

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

18989274 is a wasteful number, since it uses less digits than its factorization.

18989274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47309.

The product of its digits is 290304, while the sum is 48.

The square root of 18989274 is about 4357.6684132687. The cubic root of 18989274 is about 266.7899426554.

The spelling of 18989274 in words is "eighteen million, nine hundred eighty-nine thousand, two hundred seventy-four".