18389394 has 24 divisors (see below), whose sum is σ = 40200732. Its totient is φ = 6074880.

The previous prime is 18389389. The next prime is 18389401. The reversal of 18389394 is 49398381.

18389394 is a `hidden beast` number, since 183 + 89 + 394 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18378369 + 11025 = 4287^2 + 105^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2487 + ... + 6554.

Almost surely, 2^18389394 is an apocalyptic number.

18389394 is an abundant number, since it is smaller than the sum of its proper divisors (21811338).

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

18389394 is a wasteful number, since it uses less digits than its factorization.

18389394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9162 (or 9159 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 18389394 is about 4288.2856714543. The cubic root of 18389394 is about 263.9504900269.

The spelling of 18389394 in words is "eighteen million, three hundred eighty-nine thousand, three hundred ninety-four".