18238472132 has 24 divisors (see below), whose sum is σ = 32674944792. Its totient is φ = 8905248000.

The previous prime is 18238472129. The next prime is 18238472143. The reversal of 18238472132 is 23127483281.

It can be written as a sum of positive squares in 4 ways, for example, as 14195292736 + 4043179396 = 119144^2 + 63586^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18238472132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279719 + ... + 338702.

It is an arithmetic number, because the mean of its divisors is an integer number (1361456033).

Almost surely, 2^18238472132 is an apocalyptic number.

It is an amenable number.

18238472132 is a deficient number, since it is larger than the sum of its proper divisors (14436472660).

18238472132 is a wasteful number, since it uses less digits than its factorization.

18238472132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618599 (or 618597 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The spelling of 18238472132 in words is "eighteen billion, two hundred thirty-eight million, four hundred seventy-two thousand, one hundred thirty-two".