18809912 has 64 divisors (see below), whose sum is σ = 40629600. Its totient is φ = 8087040.

The previous prime is 18809891. The next prime is 18809941. The reversal of 18809912 is 21990881.

It is a pancake number, because a pancake can be divided into 18809912 parts by 6133 straight cuts.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172514 + ... + 172622.

Almost surely, 2^18809912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18809912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20314800).

18809912 is an abundant number, since it is smaller than the sum of its proper divisors (21819688).

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

18809912 is a wasteful number, since it uses less digits than its factorization.

18809912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 18809912 is about 4337.0395432830. The cubic root of 18809912 is about 265.9473014491.

The spelling of 18809912 in words is "eighteen million, eight hundred nine thousand, nine hundred twelve".