18399837316 has 27 divisors (see below), whose sum is σ = 37460677989. Its totient is φ = 7884830688.

The previous prime is 18399837311. The next prime is 18399837331. The reversal of 18399837316 is 61373899381.

It is a happy number.

The square root of 18399837316 is 135646.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10271011716 + 8128825600 = 101346^2 + 90160^2 .

It is not an unprimeable number, because it can be changed into a prime (18399837311) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1894200 + ... + 1903888.

Almost surely, 2^18399837316 is an apocalyptic number.

18399837316 is the 135646-th square number.

It is an amenable number.

18399837316 is an abundant number, since it is smaller than the sum of its proper divisors (19060840673).

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

18399837316 is an frugal number, since it uses more digits than its factorization.

18399837316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19396 (or 9698 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 58.

The spelling of 18399837316 in words is "eighteen billion, three hundred ninety-nine million, eight hundred thirty-seven thousand, three hundred sixteen".