18612818 has 32 divisors (see below), whose sum is σ = 33868800. Its totient is φ = 7493904.

The previous prime is 18612817. The next prime is 18612823. The reversal of 18612818 is 81821681.

It is a super-2 number, since 2×18612818² = 692873987802248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18612817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44213 + ... + 44631.

It is an arithmetic number, because the mean of its divisors is an integer number (1058400).

Almost surely, 2^18612818 is an apocalyptic number.

18612818 is a deficient number, since it is larger than the sum of its proper divisors (15255982).

18612818 is a wasteful number, since it uses less digits than its factorization.

18612818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614.

The product of its digits is 6144, while the sum is 35.

The square root of 18612818 is about 4314.2575259249. The cubic root of 18612818 is about 265.0151551793.

The spelling of 18612818 in words is "eighteen million, six hundred twelve thousand, eight hundred eighteen".