18139679 has 8 divisors (see below), whose sum is σ = 18757200. Its totient is φ = 17531136.

The previous prime is 18139633. The next prime is 18139711. The reversal of 18139679 is 97693181.

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

It is a cyclic number.

It is not a de Polignac number, because 18139679 - 2²⁴ = 1362463 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 (18139279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1997 + ... + 6345.

It is an arithmetic number, because the mean of its divisors is an integer number (2344650).

Almost surely, 2^18139679 is an apocalyptic number.

18139679 is a deficient number, since it is larger than the sum of its proper divisors (617521).

18139679 is an equidigital number, since it uses as much as digits as its factorization.

18139679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489.

The product of its digits is 81648, while the sum is 44.

The square root of 18139679 is about 4259.0702036947. The cubic root of 18139679 is about 262.7502870566.

The spelling of 18139679 in words is "eighteen million, one hundred thirty-nine thousand, six hundred seventy-nine".