16623973 has 4 divisors (see below), whose sum is σ = 16872160. Its totient is φ = 16375788.

The previous prime is 16623961. The next prime is 16624001. The reversal of 16623973 is 37932661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16623973 - 2²¹ = 14526821 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16623913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123993 + ... + 124126.

It is an arithmetic number, because the mean of its divisors is an integer number (4218040).

Almost surely, 2^16623973 is an apocalyptic number.

It is an amenable number.

16623973 is a deficient number, since it is larger than the sum of its proper divisors (248187).

16623973 is an equidigital number, since it uses as much as digits as its factorization.

16623973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248186.

The product of its digits is 40824, while the sum is 37.

The square root of 16623973 is about 4077.2506668097. The cubic root of 16623973 is about 255.2181805639.

The spelling of 16623973 in words is "sixteen million, six hundred twenty-three thousand, nine hundred seventy-three".