16972685 has 8 divisors (see below), whose sum is σ = 21069720. Its totient is φ = 13109824.

The previous prime is 16972679. The next prime is 16972693. The reversal of 16972685 is 58627961.

It can be written as a sum of positive squares in 4 ways, for example, as 4959529 + 12013156 = 2227^2 + 3466^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16972685 - 2⁸ = 16972429 is a prime.

It is a super-2 number, since 2×16972685² = 576144072218450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58382 + ... + 58671.

It is an arithmetic number, because the mean of its divisors is an integer number (2633715).

Almost surely, 2^16972685 is an apocalyptic number.

It is an amenable number.

16972685 is a deficient number, since it is larger than the sum of its proper divisors (4097035).

16972685 is a wasteful number, since it uses less digits than its factorization.

16972685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117087.

The product of its digits is 181440, while the sum is 44.

The square root of 16972685 is about 4119.7918636747. The cubic root of 16972685 is about 256.9903704245.

The spelling of 16972685 in words is "sixteen million, nine hundred seventy-two thousand, six hundred eighty-five".