18663930 has 24 divisors (see below), whose sum is σ = 48526452. Its totient is φ = 4977024.

The previous prime is 18663929. The next prime is 18663941. The reversal of 18663930 is 3936681.

It is a happy number.

18663930 is a `hidden beast` number, since 18 + 6 + 639 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18224361 + 439569 = 4269^2 + 663^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103599 + ... + 103778.

Almost surely, 2^18663930 is an apocalyptic number.

18663930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18663930 is an abundant number, since it is smaller than the sum of its proper divisors (29862522).

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

18663930 is a wasteful number, since it uses less digits than its factorization.

18663930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207390 (or 207387 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 18663930 is about 4320.1770797040. The cubic root of 18663930 is about 265.2575163771.

The spelling of 18663930 in words is "eighteen million, six hundred sixty-three thousand, nine hundred thirty".