18867864 has 32 divisors (see below), whose sum is σ = 48798000. Its totient is φ = 6072192.

The previous prime is 18867859. The next prime is 18867869. The reversal of 18867864 is 46876881.

It is an interprime number because it is at equal distance from previous prime (18867859) and next prime (18867869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18867869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12859 + ... + 14250.

Almost surely, 2^18867864 is an apocalyptic number.

It is an amenable number.

18867864 is an abundant number, since it is smaller than the sum of its proper divisors (29930136).

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

18867864 is a wasteful number, since it uses less digits than its factorization.

18867864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27147 (or 27143 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 18867864 is about 4343.7154602943. The cubic root of 18867864 is about 266.2201430074.

The spelling of 18867864 in words is "eighteen million, eight hundred sixty-seven thousand, eight hundred sixty-four".