18393344388 has 18 divisors (see below), whose sum is σ = 46494287294. Its totient is φ = 6131114784.

The previous prime is 18393344369. The next prime is 18393344393. The reversal of 18393344388 is 88344339381.

18393344388 is a `hidden beast` number, since 183 + 93 + 344 + 38 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16987994244 + 1405350144 = 130338^2 + 37488^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255463081 + ... + 255463152.

Almost surely, 2^18393344388 is an apocalyptic number.

18393344388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18393344388 is an abundant number, since it is smaller than the sum of its proper divisors (28100942906).

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

18393344388 is a wasteful number, since it uses less digits than its factorization.

18393344388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510926243 (or 510926238 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The spelling of 18393344388 in words is "eighteen billion, three hundred ninety-three million, three hundred forty-four thousand, three hundred eighty-eight".