18918312 has 48 divisors (see below), whose sum is σ = 55020960. Its totient is φ = 5404896.

The previous prime is 18918307. The next prime is 18918313. The reversal of 18918312 is 21381981.

It is not an unprimeable number, because it can be changed into a prime (18918313) 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, 6868 + ... + 9219.

It is an arithmetic number, because the mean of its divisors is an integer number (1146270).

Almost surely, 2^18918312 is an apocalyptic number.

18918312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18918312 is an abundant number, since it is smaller than the sum of its proper divisors (36102648).

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

18918312 is a wasteful number, since it uses less digits than its factorization.

18918312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16110 (or 16099 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 18918312 is about 4349.5185940515. The cubic root of 18918312 is about 266.4572007860.

The spelling of 18918312 in words is "eighteen million, nine hundred eighteen thousand, three hundred twelve".