318121818 has 24 divisors (see below), whose sum is σ = 740120832. Its totient is φ = 90891864.

The previous prime is 318121787. The next prime is 318121831. The reversal of 318121818 is 818121813.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540730 + ... + 541317.

It is an arithmetic number, because the mean of its divisors is an integer number (30838368).

Almost surely, 2^318121818 is an apocalyptic number.

318121818 is an abundant number, since it is smaller than the sum of its proper divisors (421999014).

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

318121818 is a wasteful number, since it uses less digits than its factorization.

318121818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082066 (or 1082059 counting only the distinct ones).

The product of its digits is 3072, while the sum is 33.

The square root of 318121818 is about 17835.9697801942. The cubic root of 318121818 is about 682.6495661691.

The spelling of 318121818 in words is "three hundred eighteen million, one hundred twenty-one thousand, eight hundred eighteen".