18680139 has 12 divisors (see below), whose sum is σ = 27982136. Its totient is φ = 12453264.

The previous prime is 18680113. The next prime is 18680141. The reversal of 18680139 is 93108681.

It is not a de Polignac number, because 18680139 - 2⁵ = 18680107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18680149) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 38194 + ... + 38679.

Almost surely, 2^18680139 is an apocalyptic number.

18680139 is a deficient number, since it is larger than the sum of its proper divisors (9301997).

18680139 is an frugal number, since it uses more digits than its factorization.

18680139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76888 (or 76876 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18680139 is about 4322.0526373472. The cubic root of 18680139 is about 265.3342832568.

The spelling of 18680139 in words is "eighteen million, six hundred eighty thousand, one hundred thirty-nine".