18989012 has 12 divisors (see below), whose sum is σ = 37978080. Its totient is φ = 8138136.

The previous prime is 18988967. The next prime is 18989023. The reversal of 18989012 is 21098981.

18989012 is an admirable number.

It is a super-2 number, since 2×18989012² = 721165153472288, which contains 22 as substring.

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

It is a congruent number.

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, 339062 + ... + 339117.

It is an arithmetic number, because the mean of its divisors is an integer number (3164840).

Almost surely, 2^18989012 is an apocalyptic number.

It is an amenable number.

18989012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18989012 is a wasteful number, since it uses less digits than its factorization.

18989012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678190 (or 678188 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 18989012 is about 4357.6383512173. The cubic root of 18989012 is about 266.7887156594.

The spelling of 18989012 in words is "eighteen million, nine hundred eighty-nine thousand, twelve".