18938680 has 32 divisors (see below), whose sum is σ = 45120240. Its totient is φ = 7129600.

The previous prime is 18938677. The next prime is 18938701. The reversal of 18938680 is 8683981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13246 + ... + 14605.

Almost surely, 2^18938680 is an apocalyptic number.

18938680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18938680 is an abundant number, since it is smaller than the sum of its proper divisors (26181560).

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

18938680 is a wasteful number, since it uses less digits than its factorization.

18938680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27879 (or 27875 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18938680 is about 4351.8593727279. The cubic root of 18938680 is about 266.5527916565.

The spelling of 18938680 in words is "eighteen million, nine hundred thirty-eight thousand, six hundred eighty".