18240492 has 24 divisors (see below), whose sum is σ = 42630336. Its totient is φ = 6070288.

The previous prime is 18240479. The next prime is 18240511. The reversal of 18240492 is 29404281.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13303 + ... + 14609.

It is an arithmetic number, because the mean of its divisors is an integer number (1776264).

Almost surely, 2^18240492 is an apocalyptic number.

18240492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18240492 is an abundant number, since it is smaller than the sum of its proper divisors (24389844).

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

18240492 is a wasteful number, since it uses less digits than its factorization.

18240492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477 (or 2475 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18240492 is about 4270.8889004515. Note that the first 3 decimals coincide. The cubic root of 18240492 is about 263.2361413833.

The spelling of 18240492 in words is "eighteen million, two hundred forty thousand, four hundred ninety-two".