18212818 has 16 divisors (see below), whose sum is σ = 29796480. Its totient is φ = 8298576.

The previous prime is 18212807. The next prime is 18212827. The reversal of 18212818 is 81821281.

It is a happy number.

It is a super-2 number, since 2×18212818² = 663413479002248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18212818.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (1862280).

Almost surely, 2^18212818 is an apocalyptic number.

18212818 is a deficient number, since it is larger than the sum of its proper divisors (11583662).

18212818 is a wasteful number, since it uses less digits than its factorization.

18212818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8961.

The product of its digits is 2048, while the sum is 31.

The square root of 18212818 is about 4267.6478298941. The cubic root of 18212818 is about 263.1029489930.

The spelling of 18212818 in words is "eighteen million, two hundred twelve thousand, eight hundred eighteen".