18500240 has 40 divisors (see below), whose sum is σ = 46925568. Its totient is φ = 6727040.

The previous prime is 18500239. The next prime is 18500249. The reversal of 18500240 is 4200581.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (18500249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9632 + ... + 11391.

Almost surely, 2^18500240 is an apocalyptic number.

18500240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18500240 is an abundant number, since it is smaller than the sum of its proper divisors (28425328).

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

18500240 is a wasteful number, since it uses less digits than its factorization.

18500240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21047 (or 21041 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 18500240 is about 4301.1905328641. The cubic root of 18500240 is about 264.4797673211.

The spelling of 18500240 in words is "eighteen million, five hundred thousand, two hundred forty".