18932432238 has 64 divisors (see below), whose sum is σ = 45037152000. Its totient is φ = 5877310752.

The previous prime is 18932432227. The next prime is 18932432269. The reversal of 18932432238 is 83223423981.

18932432238 is a `hidden beast` number, since 189 + 3 + 2 + 432 + 2 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18932432193 and 18932432202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95845 + ... + 216912.

It is an arithmetic number, because the mean of its divisors is an integer number (703705500).

Almost surely, 2^18932432238 is an apocalyptic number.

18932432238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18932432238 is an abundant number, since it is smaller than the sum of its proper divisors (26104719762).

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

18932432238 is a wasteful number, since it uses less digits than its factorization.

18932432238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312846 (or 312840 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The spelling of 18932432238 in words is "eighteen billion, nine hundred thirty-two million, four hundred thirty-two thousand, two hundred thirty-eight".