13618818 has 12 divisors (see below), whose sum is σ = 29507478. Its totient is φ = 4539600.

The previous prime is 13618817. The next prime is 13618837. The reversal of 13618818 is 81881631.

It can be written as a sum of positive squares in only one way, i.e., 9566649 + 4052169 = 3093^2 + 2013^2 .

It is not an unprimeable number, because it can be changed into a prime (13618817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 378283 + ... + 378318.

Almost surely, 2^13618818 is an apocalyptic number.

13618818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13618818 is an abundant number, since it is smaller than the sum of its proper divisors (15888660).

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

13618818 is a wasteful number, since it uses less digits than its factorization.

13618818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756609 (or 756606 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 13618818 is about 3690.3682743054. The cubic root of 13618818 is about 238.8066806208.

It can be divided in two parts, 1361881 and 8, that added together give a square (1361889 = 1167²).

The spelling of 13618818 in words is "thirteen million, six hundred eighteen thousand, eight hundred eighteen".