18389499736804 has 81 divisors (see below), whose sum is σ = 37695051335529. Its totient is φ = 7827001509600.

The previous prime is 18389499736793. The next prime is 18389499736813. The reversal of 18389499736804 is 40863799498381.

The square root of 18389499736804 is 4288298.

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., 5390244456100 + 12999255280704 = 2321690^2 + 3605448^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9425678029 + ... + 9425679979.

Almost surely, 2^{18389499736804} is an apocalyptic number.

18389499736804 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18389499736804 is the 4288298-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18389499736804

18389499736804 is an abundant number, since it is smaller than the sum of its proper divisors (19305551598725).

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

18389499736804 is an frugal number, since it uses more digits than its factorization.

18389499736804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4234 (or 2117 counting only the distinct ones).

The product of its (nonzero) digits is 2257403904, while the sum is 79.

The spelling of 18389499736804 in words is "eighteen trillion, three hundred eighty-nine billion, four hundred ninety-nine million, seven hundred thirty-six thousand, eight hundred four".