18819912 has 32 divisors (see below), whose sum is σ = 47184480. Its totient is φ = 6255360.

The previous prime is 18819893. The next prime is 18819917. The reversal of 18819912 is 21991881.

It is not an unprimeable number, because it can be changed into a prime (18819917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9487 + ... + 11297.

It is an arithmetic number, because the mean of its divisors is an integer number (1474515).

Almost surely, 2^18819912 is an apocalyptic number.

18819912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18819912 is an abundant number, since it is smaller than the sum of its proper divisors (28364568).

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

18819912 is a wasteful number, since it uses less digits than its factorization.

18819912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253 (or 2249 counting only the distinct ones).

The product of its digits is 10368, while the sum is 39.

The square root of 18819912 is about 4338.1922502351. The cubic root of 18819912 is about 265.9944220286.

It can be divided in two parts, 188 and 19912, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 18819912 in words is "eighteen million, eight hundred nineteen thousand, nine hundred twelve".