18868780 has 24 divisors (see below), whose sum is σ = 45285408. Its totient is φ = 6469248.

The previous prime is 18868777. The next prime is 18868781. The reversal of 18868780 is 8786881.

It is a self number, because there is not a number n which added to its sum of digits gives 18868780.

It is not an unprimeable number, because it can be changed into a prime (18868781) 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, 67249 + ... + 67528.

It is an arithmetic number, because the mean of its divisors is an integer number (1886892).

Almost surely, 2^18868780 is an apocalyptic number.

18868780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18868780 is an abundant number, since it is smaller than the sum of its proper divisors (26416628).

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

18868780 is a wasteful number, since it uses less digits than its factorization.

18868780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134793 (or 134791 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 46.

The square root of 18868780 is about 4343.8208987020. The cubic root of 18868780 is about 266.2244511034.

The spelling of 18868780 in words is "eighteen million, eight hundred sixty-eight thousand, seven hundred eighty".