18223838388 has 36 divisors (see below), whose sum is σ = 52646644960. Its totient is φ = 5206810896.

The previous prime is 18223838363. The next prime is 18223838393. The reversal of 18223838388 is 88383832281.

It is a happy number.

18223838388 is a `hidden beast` number, since 1 + 8 + 223 + 8 + 38 + 388 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36158158 + ... + 36158661.

Almost surely, 2^18223838388 is an apocalyptic number.

18223838388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18223838388 is an abundant number, since it is smaller than the sum of its proper divisors (34422806572).

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

18223838388 is a wasteful number, since it uses less digits than its factorization.

18223838388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72316836 (or 72316831 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 54.

The spelling of 18223838388 in words is "eighteen billion, two hundred twenty-three million, eight hundred thirty-eight thousand, three hundred eighty-eight".