18979715 has 8 divisors (see below), whose sum is σ = 23766048. Its totient is φ = 14523520.

The previous prime is 18979703. The next prime is 18979721. The reversal of 18979715 is 51797981.

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

It is not a de Polignac number, because 18979715 - 2¹⁰ = 18978691 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 18979715.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 82406 + ... + 82635.

It is an arithmetic number, because the mean of its divisors is an integer number (2970756).

Almost surely, 2^18979715 is an apocalyptic number.

18979715 is a deficient number, since it is larger than the sum of its proper divisors (4786333).

18979715 is a wasteful number, since it uses less digits than its factorization.

18979715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165069.

The product of its digits is 158760, while the sum is 47.

The square root of 18979715 is about 4356.5714730738. The cubic root of 18979715 is about 266.7451687284.

The spelling of 18979715 in words is "eighteen million, nine hundred seventy-nine thousand, seven hundred fifteen".