16566939 has 6 divisors (see below), whose sum is σ = 23930036. Its totient is φ = 11044620.

The previous prime is 16566931. The next prime is 16566941. The reversal of 16566939 is 93966561.

It is not a de Polignac number, because 16566939 - 2³ = 16566931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16566894 and 16566903.

It is not an unprimeable number, because it can be changed into a prime (16566931) 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, 920377 + ... + 920394.

Almost surely, 2^16566939 is an apocalyptic number.

16566939 is a deficient number, since it is larger than the sum of its proper divisors (7363097).

16566939 is a wasteful number, since it uses less digits than its factorization.

16566939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840777 (or 1840774 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 16566939 is about 4070.2504836926. The cubic root of 16566939 is about 254.9259762070.

The spelling of 16566939 in words is "sixteen million, five hundred sixty-six thousand, nine hundred thirty-nine".