16864979 has 4 divisors (see below), whose sum is σ = 17446560. Its totient is φ = 16283400.

The previous prime is 16864943. The next prime is 16864993. The reversal of 16864979 is 97946861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16864979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16864909) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 290747 + ... + 290804.

It is an arithmetic number, because the mean of its divisors is an integer number (4361640).

Almost surely, 2^16864979 is an apocalyptic number.

16864979 is a deficient number, since it is larger than the sum of its proper divisors (581581).

16864979 is an equidigital number, since it uses as much as digits as its factorization.

16864979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581580.

The product of its digits is 653184, while the sum is 50.

The square root of 16864979 is about 4106.6992828791. The cubic root of 16864979 is about 256.4456095955.

The spelling of 16864979 in words is "sixteen million, eight hundred sixty-four thousand, nine hundred seventy-nine".