16972709 has 4 divisors (see below), whose sum is σ = 18278316. Its totient is φ = 15667104.

The previous prime is 16972699. The next prime is 16972721. The reversal of 16972709 is 90727961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90727961 = 5503 ⋅16487.

It can be written as a sum of positive squares in 2 ways, for example, as 9628609 + 7344100 = 3103^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 16972709 - 2⁴ = 16972693 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 (16972759) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 652784 + ... + 652809.

It is an arithmetic number, because the mean of its divisors is an integer number (4569579).

Almost surely, 2^16972709 is an apocalyptic number.

It is an amenable number.

16972709 is a deficient number, since it is larger than the sum of its proper divisors (1305607).

16972709 is a wasteful number, since it uses less digits than its factorization.

16972709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305606.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 16972709 is about 4119.7947764421. The cubic root of 16972709 is about 256.9904915557.

The spelling of 16972709 in words is "sixteen million, nine hundred seventy-two thousand, seven hundred nine".