18007839 has 20 divisors (see below), whose sum is σ = 28318840. Its totient is φ = 11372400.

The previous prime is 18007831. The next prime is 18007849. The reversal of 18007839 is 93870081.

It is not a de Polignac number, because 18007839 - 2³ = 18007831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18007831) 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 19 ways as a sum of consecutive naturals, for example, 4312 + ... + 7389.

It is an arithmetic number, because the mean of its divisors is an integer number (1415942).

Almost surely, 2^18007839 is an apocalyptic number.

18007839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18007839 is a deficient number, since it is larger than the sum of its proper divisors (10311001).

18007839 is a wasteful number, since it uses less digits than its factorization.

18007839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11732 (or 11723 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 18007839 is about 4243.5644215683. The cubic root of 18007839 is about 262.1121783287.

The spelling of 18007839 in words is "eighteen million, seven thousand, eight hundred thirty-nine".