18939679 has 8 divisors (see below), whose sum is σ = 20718288. Its totient is φ = 17170560.

The previous prime is 18939677. The next prime is 18939689. The reversal of 18939679 is 97693981.

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

It is not a de Polignac number, because 18939679 - 2¹ = 18939677 is a prime.

It is a super-2 number, since 2×18939679² = 717422881246082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939673) 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, 2199 + ... + 6535.

It is an arithmetic number, because the mean of its divisors is an integer number (2589786).

Almost surely, 2^18939679 is an apocalyptic number.

18939679 is a deficient number, since it is larger than the sum of its proper divisors (1778609).

18939679 is a wasteful number, since it uses less digits than its factorization.

18939679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745.

The product of its digits is 734832, while the sum is 52.

The square root of 18939679 is about 4351.9741497394. The cubic root of 18939679 is about 266.5574783886.

The spelling of 18939679 in words is "eighteen million, nine hundred thirty-nine thousand, six hundred seventy-nine".