18378472 has 64 divisors (see below), whose sum is σ = 43315200. Its totient is φ = 7128000.

The previous prime is 18378461. The next prime is 18378473. The reversal of 18378472 is 27487381.

It is not an unprimeable number, because it can be changed into a prime (18378473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24097 + ... + 24847.

It is an arithmetic number, because the mean of its divisors is an integer number (676800).

Almost surely, 2^18378472 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 18378472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21657600).

18378472 is an abundant number, since it is smaller than the sum of its proper divisors (24936728).

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

18378472 is a wasteful number, since it uses less digits than its factorization.

18378472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 802 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 18378472 is about 4287.0120130459. The cubic root of 18378472 is about 263.8982237010.

The spelling of 18378472 in words is "eighteen million, three hundred seventy-eight thousand, four hundred seventy-two".