18939630 has 32 divisors (see below), whose sum is σ = 45622944. Its totient is φ = 5031936.

The previous prime is 18939629. The next prime is 18939643. The reversal of 18939630 is 3693981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8382 + ... + 10398.

It is an arithmetic number, because the mean of its divisors is an integer number (1425717).

Almost surely, 2^18939630 is an apocalyptic number.

18939630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18939630 is an abundant number, since it is smaller than the sum of its proper divisors (26683314).

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

18939630 is a wasteful number, since it uses less digits than its factorization.

18939630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 18939630 is about 4351.9685201067. The cubic root of 18939630 is about 266.5572485127.

The spelling of 18939630 in words is "eighteen million, nine hundred thirty-nine thousand, six hundred thirty".