18919908 has 36 divisors (see below), whose sum is σ = 54658240. Its totient is φ = 5405616.

The previous prime is 18919907. The next prime is 18919939. The reversal of 18919908 is 80991981.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18919907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37288 + ... + 37791.

Almost surely, 2^18919908 is an apocalyptic number.

18919908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18919908 is an abundant number, since it is smaller than the sum of its proper divisors (35738332).

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

18919908 is a wasteful number, since it uses less digits than its factorization.

18919908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75096 (or 75091 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 18919908 is about 4349.7020587622. The cubic root of 18919908 is about 266.4646935922.

The spelling of 18919908 in words is "eighteen million, nine hundred nineteen thousand, nine hundred eight".