18239240 has 64 divisors (see below), whose sum is σ = 43804800. Its totient is φ = 6815232.

The previous prime is 18239233. The next prime is 18239251. The reversal of 18239240 is 4293281.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78164 + ... + 78396.

It is an arithmetic number, because the mean of its divisors is an integer number (684450).

Almost surely, 2^18239240 is an apocalyptic number.

18239240 is a gapful number since it is divisible by the number (10) 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 18239240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21902400).

18239240 is an abundant number, since it is smaller than the sum of its proper divisors (25565560).

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

18239240 is a wasteful number, since it uses less digits than its factorization.

18239240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18239240 is about 4270.7423242336. The cubic root of 18239240 is about 263.2301185342.

The spelling of 18239240 in words is "eighteen million, two hundred thirty-nine thousand, two hundred forty".