18638830 has 16 divisors (see below), whose sum is σ = 38342880. Its totient is φ = 6390432.

The previous prime is 18638821. The next prime is 18638833. The reversal of 18638830 is 3883681.

It is a self number, because there is not a number n which added to its sum of digits gives 18638830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18638833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133065 + ... + 133204.

It is an arithmetic number, because the mean of its divisors is an integer number (2396430).

Almost surely, 2^18638830 is an apocalyptic number.

18638830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18638830 is an abundant number, since it is smaller than the sum of its proper divisors (19704050).

18638830 is a wasteful number, since it uses less digits than its factorization.

18638830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266283.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18638830 is about 4317.2711288498. The cubic root of 18638830 is about 265.1385533912.

The spelling of 18638830 in words is "eighteen million, six hundred thirty-eight thousand, eight hundred thirty".