18985100 has 18 divisors (see below), whose sum is σ = 41197884. Its totient is φ = 7594000.

The previous prime is 18985093. The next prime is 18985157. The reversal of 18985100 is 158981.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 94826 + ... + 95025.

Almost surely, 2^18985100 is an apocalyptic number.

18985100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18985100 is an abundant number, since it is smaller than the sum of its proper divisors (22212784).

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

18985100 is a wasteful number, since it uses less digits than its factorization.

18985100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189865 (or 189858 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 18985100 is about 4357.1894611091. The cubic root of 18985100 is about 266.7703936752.

The spelling of 18985100 in words is "eighteen million, nine hundred eighty-five thousand, one hundred".