18008439 has 8 divisors (see below), whose sum is σ = 24195072. Its totient is φ = 11913720.

The previous prime is 18008413. The next prime is 18008467. The reversal of 18008439 is 93480081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18008439 - 2⁷ = 18008311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008479) by changing a digit.

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, 22519 + ... + 23304.

It is an arithmetic number, because the mean of its divisors is an integer number (3024384).

Almost surely, 2^18008439 is an apocalyptic number.

18008439 is a deficient number, since it is larger than the sum of its proper divisors (6186633).

18008439 is a wasteful number, since it uses less digits than its factorization.

18008439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45957.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 18008439 is about 4243.6351162653. The cubic root of 18008439 is about 262.1150893861.

The spelling of 18008439 in words is "eighteen million, eight thousand, four hundred thirty-nine".