18686930 has 8 divisors (see below), whose sum is σ = 33636492. Its totient is φ = 7474768.

The previous prime is 18686911. The next prime is 18686947. The reversal of 18686930 is 3968681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16834609 + 1852321 = 4103^2 + 1361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 934337 + ... + 934356.

Almost surely, 2^18686930 is an apocalyptic number.

18686930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18686930 is a deficient number, since it is larger than the sum of its proper divisors (14949562).

18686930 is a wasteful number, since it uses less digits than its factorization.

18686930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868700.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18686930 is about 4322.8381880427. The cubic root of 18686930 is about 265.3664326752.

The spelling of 18686930 in words is "eighteen million, six hundred eighty-six thousand, nine hundred thirty".