16997723 has 12 divisors (see below), whose sum is σ = 18271560. Its totient is φ = 15768576.

The previous prime is 16997707. The next prime is 16997767. The reversal of 16997723 is 32779961.

It is a happy number.

It is not a de Polignac number, because 16997723 - 2⁴ = 16997707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16997623) 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 11 ways as a sum of consecutive naturals, for example, 66011 + ... + 66267.

It is an arithmetic number, because the mean of its divisors is an integer number (1522630).

Almost surely, 2^16997723 is an apocalyptic number.

16997723 is a deficient number, since it is larger than the sum of its proper divisors (1273837).

16997723 is an equidigital number, since it uses as much as digits as its factorization.

16997723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 335 counting only the distinct ones).

The product of its digits is 142884, while the sum is 44.

The square root of 16997723 is about 4122.8294895617. The cubic root of 16997723 is about 257.1166785372.

The spelling of 16997723 in words is "sixteen million, nine hundred ninety-seven thousand, seven hundred twenty-three".