16691972 has 24 divisors (see below), whose sum is σ = 31987200. Its totient is φ = 7558560.

The previous prime is 16691963. The next prime is 16692019. The reversal of 16691972 is 27919661.

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 in 7 ways as a sum of consecutive naturals, for example, 14813 + ... + 15899.

It is an arithmetic number, because the mean of its divisors is an integer number (1332800).

Almost surely, 2^16691972 is an apocalyptic number.

It is an amenable number.

16691972 is a deficient number, since it is larger than the sum of its proper divisors (15295228).

16691972 is a wasteful number, since it uses less digits than its factorization.

16691972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451 (or 1449 counting only the distinct ones).

The product of its digits is 40824, while the sum is 41.

The square root of 16691972 is about 4085.5809868365. The cubic root of 16691972 is about 255.5656901953.

The spelling of 16691972 in words is "sixteen million, six hundred ninety-one thousand, nine hundred seventy-two".