18900100 has 36 divisors (see below), whose sum is σ = 41209168. Its totient is φ = 7524000.

The previous prime is 18900071. The next prime is 18900103. The reversal of 18900100 is 100981.

It is not an unprimeable number, because it can be changed into a prime (18900103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32815 + ... + 33385.

Almost surely, 2^18900100 is an apocalyptic number.

18900100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18900100 is an abundant number, since it is smaller than the sum of its proper divisors (22309068).

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

18900100 is a wasteful number, since it uses less digits than its factorization.

18900100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 18900100 is about 4347.4245249343. The cubic root of 18900100 is about 266.3716703124.

The spelling of 18900100 in words is "eighteen million, nine hundred thousand, one hundred".