18090240 has 144 divisors (see below), whose sum is σ = 66127488. Its totient is φ = 4128768.

The previous prime is 18090197. The next prime is 18090257. The reversal of 18090240 is 4209081.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18090240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26544 + ... + 27216.

Almost surely, 2^18090240 is an apocalyptic number.

18090240 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 18090240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33063744).

18090240 is an abundant number, since it is smaller than the sum of its proper divisors (48037248).

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

18090240 is an equidigital number, since it uses as much as digits as its factorization.

18090240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18090240 is about 4253.2622773584. The cubic root of 18090240 is about 262.5113645873.

The spelling of 18090240 in words is "eighteen million, ninety thousand, two hundred forty".