18279872 has 56 divisors (see below), whose sum is σ = 39599616. Its totient is φ = 8322048.

The previous prime is 18279839. The next prime is 18279883. The reversal of 18279872 is 27897281.

It is a congruent number.

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, 105578 + ... + 105750.

It is an arithmetic number, because the mean of its divisors is an integer number (707136).

Almost surely, 2^18279872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18279872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19799808).

18279872 is an abundant number, since it is smaller than the sum of its proper divisors (21319744).

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

18279872 is a wasteful number, since it uses less digits than its factorization.

18279872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 315 counting only the distinct ones).

The product of its digits is 112896, while the sum is 44.

The square root of 18279872 is about 4275.4966962916. The cubic root of 18279872 is about 263.4254416166.

The spelling of 18279872 in words is "eighteen million, two hundred seventy-nine thousand, eight hundred seventy-two".