18979713 has 6 divisors (see below), whose sum is σ = 27415154. Its totient is φ = 12653136.

The previous prime is 18979703. The next prime is 18979721. The reversal of 18979713 is 31797981.

It can be written as a sum of positive squares in only one way, i.e., 17740944 + 1238769 = 4212^2 + 1113^2 .

It is not a de Polignac number, because 18979713 - 2¹³ = 18971521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18979703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1054420 + ... + 1054437.

Almost surely, 2^18979713 is an apocalyptic number.

It is an amenable number.

18979713 is a deficient number, since it is larger than the sum of its proper divisors (8435441).

18979713 is a wasteful number, since it uses less digits than its factorization.

18979713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108863 (or 2108860 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 18979713 is about 4356.5712435354. The cubic root of 18979713 is about 266.7451593589.

The spelling of 18979713 in words is "eighteen million, nine hundred seventy-nine thousand, seven hundred thirteen".