18638950 has 24 divisors (see below), whose sum is σ = 37821240. Its totient is φ = 6777600.

The previous prime is 18638923. The next prime is 18638957. The reversal of 18638950 is 5983681.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18638957) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 16395 + ... + 17494.

It is an arithmetic number, because the mean of its divisors is an integer number (1575885).

Almost surely, 2^18638950 is an apocalyptic number.

18638950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18638950 is an abundant number, since it is smaller than the sum of its proper divisors (19182290).

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

18638950 is a wasteful number, since it uses less digits than its factorization.

18638950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33912 (or 33907 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 18638950 is about 4317.2850264952. The cubic root of 18638950 is about 265.1391223925.

The spelling of 18638950 in words is "eighteen million, six hundred thirty-eight thousand, nine hundred fifty".