18939472272 has 160 divisors (see below), whose sum is σ = 63148616960. Its totient is φ = 5322516480.

The previous prime is 18939472259. The next prime is 18939472313. The reversal of 18939472272 is 27227493981.

It is a happy number.

18939472272 is a `hidden beast` number, since 18 + 93 + 9 + 472 + 2 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

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, 133128 + ... + 235800.

It is an arithmetic number, because the mean of its divisors is an integer number (394678856).

Almost surely, 2^18939472272 is an apocalyptic number.

18939472272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18939472272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31574308480).

18939472272 is an abundant number, since it is smaller than the sum of its proper divisors (44209144688).

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

18939472272 is a wasteful number, since it uses less digits than its factorization.

18939472272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102758 (or 102746 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 18939472272 in words is "eighteen billion, nine hundred thirty-nine million, four hundred seventy-two thousand, two hundred seventy-two".