18868284 has 18 divisors (see below), whose sum is σ = 47694920. Its totient is φ = 6289416.

The previous prime is 18868279. The next prime is 18868301. The reversal of 18868284 is 48286881.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×18868284² = 712024282209312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 262024 + ... + 262095.

Almost surely, 2^18868284 is an apocalyptic number.

It is an amenable number.

18868284 is an abundant number, since it is smaller than the sum of its proper divisors (28826636).

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

18868284 is a wasteful number, since it uses less digits than its factorization.

18868284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524129 (or 524124 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 18868284 is about 4343.7638057335. The cubic root of 18868284 is about 266.2221183526. Note that the first 3 decimals are identical.

The spelling of 18868284 in words is "eighteen million, eight hundred sixty-eight thousand, two hundred eighty-four".