18638850 has 48 divisors (see below), whose sum is σ = 46613088. Its totient is φ = 4928640.

The previous prime is 18638839. The next prime is 18638863. The reversal of 18638850 is 5883681.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18638799 and 18638808.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20097 + ... + 21003.

It is an arithmetic number, because the mean of its divisors is an integer number (971106).

Almost surely, 2^18638850 is an apocalyptic number.

18638850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18638850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23306544).

18638850 is an abundant number, since it is smaller than the sum of its proper divisors (27974238).

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

18638850 is a wasteful number, since it uses less digits than its factorization.

18638850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 18638850 is about 4317.2734451271. The cubic root of 18638850 is about 265.1386482249.

The spelling of 18638850 in words is "eighteen million, six hundred thirty-eight thousand, eight hundred fifty".