16979917 has 4 divisors (see below), whose sum is σ = 17103996. Its totient is φ = 16855840.

The previous prime is 16979903. The next prime is 16979933. The reversal of 16979917 is 71997961.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12574116 + 4405801 = 3546^2 + 2099^2 .

It is a cyclic number.

It is not a de Polignac number, because 16979917 - 2¹⁵ = 16947149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16974917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61834 + ... + 62107.

It is an arithmetic number, because the mean of its divisors is an integer number (4275999).

Almost surely, 2^16979917 is an apocalyptic number.

It is an amenable number.

16979917 is a deficient number, since it is larger than the sum of its proper divisors (124079).

16979917 is a wasteful number, since it uses less digits than its factorization.

16979917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124078.

The product of its digits is 214326, while the sum is 49.

The square root of 16979917 is about 4120.6694844406. The cubic root of 16979917 is about 257.0268661321.

The spelling of 16979917 in words is "sixteen million, nine hundred seventy-nine thousand, nine hundred seventeen".