18686380 has 12 divisors (see below), whose sum is σ = 39241440. Its totient is φ = 7474544.

The previous prime is 18686377. The next prime is 18686407. The reversal of 18686380 is 8368681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467140 + ... + 467179.

It is an arithmetic number, because the mean of its divisors is an integer number (3270120).

Almost surely, 2^18686380 is an apocalyptic number.

18686380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18686380 is an abundant number, since it is smaller than the sum of its proper divisors (20555060).

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

18686380 is a wasteful number, since it uses less digits than its factorization.

18686380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934328 (or 934326 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 18686380 is about 4322.7745719619. The cubic root of 18686380 is about 265.3638291983.

The spelling of 18686380 in words is "eighteen million, six hundred eighty-six thousand, three hundred eighty".