18208039 has 4 divisors (see below), whose sum is σ = 18216640. Its totient is φ = 18199440.

The previous prime is 18208013. The next prime is 18208051. The reversal of 18208039 is 93080281.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93080281 = 7 ⋅13297183.

It is a cyclic number.

It is not a de Polignac number, because 18208039 - 2⁵ = 18208007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18208039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18208009) 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 3 ways as a sum of consecutive naturals, for example, 1354 + ... + 6184.

It is an arithmetic number, because the mean of its divisors is an integer number (4554160).

Almost surely, 2^18208039 is an apocalyptic number.

18208039 is a deficient number, since it is larger than the sum of its proper divisors (8601).

18208039 is an equidigital number, since it uses as much as digits as its factorization.

18208039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8600.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18208039 is about 4267.0878828541. The cubic root of 18208039 is about 263.0799344512.

The spelling of 18208039 in words is "eighteen million, two hundred eight thousand, thirty-nine".