16623172 has 6 divisors (see below), whose sum is σ = 29090558. Its totient is φ = 8311584.

The previous prime is 16623143. The next prime is 16623197. The reversal of 16623172 is 27132661.

It can be written as a sum of positive squares in only one way, i.e., 11397376 + 5225796 = 3376^2 + 2286^2 .

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 16623172.

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 as a sum of consecutive naturals, namely, 2077893 + ... + 2077900.

Almost surely, 2^16623172 is an apocalyptic number.

It is an amenable number.

16623172 is a deficient number, since it is larger than the sum of its proper divisors (12467386).

16623172 is a wasteful number, since it uses less digits than its factorization.

16623172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155797 (or 4155795 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 16623172 is about 4077.1524376702. The cubic root of 16623172 is about 255.2140814025.

The spelling of 16623172 in words is "sixteen million, six hundred twenty-three thousand, one hundred seventy-two".