18905900 has 36 divisors (see below), whose sum is σ = 44184672. Its totient is φ = 6980160.

The previous prime is 18905869. The next prime is 18905923. The reversal of 18905900 is 950981.

It is an unprimeable number.

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, 5972 + ... + 8571.

It is an arithmetic number, because the mean of its divisors is an integer number (1227352).

Almost surely, 2^18905900 is an apocalyptic number.

18905900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18905900 is an abundant number, since it is smaller than the sum of its proper divisors (25278772).

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

18905900 is a wasteful number, since it uses less digits than its factorization.

18905900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14570 (or 14563 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 18905900 is about 4348.0915353750. The cubic root of 18905900 is about 266.3989152772.

The spelling of 18905900 in words is "eighteen million, nine hundred five thousand, nine hundred".