18924404356 has 135 divisors (see below), whose sum is σ = 40530141897. Its totient is φ = 7725706560.

The previous prime is 18924404353. The next prime is 18924404363. The reversal of 18924404356 is 65340442981.

The square root of 18924404356 is 137566.

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

It can be written as a sum of positive squares in 7 ways, for example, as 15205356100 + 3719048256 = 123310^2 + 60984^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18924404353) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 511470370 + ... + 511470406.

Almost surely, 2^18924404356 is an apocalyptic number.

18924404356 is the 137566-th square number.

It is an amenable number.

18924404356 is an abundant number, since it is smaller than the sum of its proper divisors (21605737541).

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

18924404356 is an equidigital number, since it uses as much as digits as its factorization.

18924404356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 18924404356 in words is "eighteen billion, nine hundred twenty-four million, four hundred four thousand, three hundred fifty-six".