18040339 has 4 divisors (see below), whose sum is σ = 18424224. Its totient is φ = 17656456.

The previous prime is 18040333. The next prime is 18040387. The reversal of 18040339 is 93304081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93304081 = 13 ⋅7177237.

It is a cyclic number.

It is not a de Polignac number, because 18040339 - 2³ = 18040331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18040331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191872 + ... + 191965.

It is an arithmetic number, because the mean of its divisors is an integer number (4606056).

Almost surely, 2^18040339 is an apocalyptic number.

18040339 is a deficient number, since it is larger than the sum of its proper divisors (383885).

18040339 is an equidigital number, since it uses as much as digits as its factorization.

18040339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383884.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 18040339 is about 4247.3920233480. The cubic root of 18040339 is about 262.2697675911.

The spelling of 18040339 in words is "eighteen million, forty thousand, three hundred thirty-nine".