18904932172 has 12 divisors (see below), whose sum is σ = 37809864400. Its totient is φ = 8102113776.

The previous prime is 18904932169. The next prime is 18904932191. The reversal of 18904932172 is 27123940981.

It is a happy number.

18904932172 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337588047 + ... + 337588102.

Almost surely, 2^18904932172 is an apocalyptic number.

It is an amenable number.

18904932172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18904932172 is a wasteful number, since it uses less digits than its factorization.

18904932172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675176160 (or 675176158 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

It can be divided in two parts, 18904932 and 172, that added together give a square (18905104 = 4348²).

The spelling of 18904932172 in words is "eighteen billion, nine hundred four million, nine hundred thirty-two thousand, one hundred seventy-two".