18696979 has 12 divisors (see below), whose sum is σ = 22051704. Its totient is φ = 15803424.

The previous prime is 18696949. The next prime is 18696983. The reversal of 18696979 is 97969681.

It is not a de Polignac number, because 18696979 - 2⁵ = 18696947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18696919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 964 + ... + 6190.

It is an arithmetic number, because the mean of its divisors is an integer number (1837642).

Almost surely, 2^18696979 is an apocalyptic number.

18696979 is a deficient number, since it is larger than the sum of its proper divisors (3354725).

18696979 is an equidigital number, since it uses as much as digits as its factorization.

18696979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5314 (or 5307 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 55.

The square root of 18696979 is about 4324.0003469010. Note that the first 3 decimals coincide. The cubic root of 18696979 is about 265.4139915736.

The spelling of 18696979 in words is "eighteen million, six hundred ninety-six thousand, nine hundred seventy-nine".