18242340 has 24 divisors (see below), whose sum is σ = 51078720. Its totient is φ = 4864608.

The previous prime is 18242333. The next prime is 18242359. The reversal of 18242340 is 4324281.

It is a self number, because there is not a number n which added to its sum of digits gives 18242340.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151960 + ... + 152079.

It is an arithmetic number, because the mean of its divisors is an integer number (2128280).

Almost surely, 2^18242340 is an apocalyptic number.

18242340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18242340 is an abundant number, since it is smaller than the sum of its proper divisors (32836380).

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

18242340 is a wasteful number, since it uses less digits than its factorization.

18242340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304051 (or 304049 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 18242340 is about 4271.1052433767. The cubic root of 18242340 is about 263.2450308358.

The spelling of 18242340 in words is "eighteen million, two hundred forty-two thousand, three hundred forty".