16972173 has 10 divisors (see below), whose sum is σ = 25353614. Its totient is φ = 11314728.

The previous prime is 16972169. The next prime is 16972223. The reversal of 16972173 is 37127961.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 1432809 = 3942^2 + 1197^2 .

It is not a de Polignac number, because 16972173 - 2² = 16972169 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 (16972133) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 104686 + ... + 104847.

Almost surely, 2^16972173 is an apocalyptic number.

It is an amenable number.

16972173 is a deficient number, since it is larger than the sum of its proper divisors (8381441).

16972173 is an equidigital number, since it uses as much as digits as its factorization.

16972173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209545 (or 209536 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 16972173 is about 4119.7297241445. The cubic root of 16972173 is about 256.9877862647.

The spelling of 16972173 in words is "sixteen million, nine hundred seventy-two thousand, one hundred seventy-three".