18311796 has 18 divisors (see below), whose sum is σ = 46288242. Its totient is φ = 6103920.

The previous prime is 18311779. The next prime is 18311807. The reversal of 18311796 is 69711381.

It can be written as a sum of positive squares in only one way, i.e., 11655396 + 6656400 = 3414^2 + 2580^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 508661 = 18311796 / (1 + 8 + 3 + 1 + 1 + 7 + 9 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 18311796.

It is a congruent number.

It is an unprimeable number.

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, 254295 + ... + 254366.

It is an arithmetic number, because the mean of its divisors is an integer number (2571569).

Almost surely, 2^18311796 is an apocalyptic number.

It is an amenable number.

18311796 is an abundant number, since it is smaller than the sum of its proper divisors (27976446).

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

18311796 is a wasteful number, since it uses less digits than its factorization.

18311796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508671 (or 508666 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 18311796 is about 4279.2284351271. The cubic root of 18311796 is about 263.5787013155.

The spelling of 18311796 in words is "eighteen million, three hundred eleven thousand, seven hundred ninety-six".