16672891 has 4 divisors (see below), whose sum is σ = 16696800. Its totient is φ = 16648984.

The previous prime is 16672867. The next prime is 16672897. The reversal of 16672891 is 19827661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16672891 - 2¹⁵ = 16640123 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16672897) 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, 10876 + ... + 12313.

It is an arithmetic number, because the mean of its divisors is an integer number (4174200).

Almost surely, 2^16672891 is an apocalyptic number.

16672891 is a deficient number, since it is larger than the sum of its proper divisors (23909).

16672891 is an equidigital number, since it uses as much as digits as its factorization.

16672891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23908.

The product of its digits is 36288, while the sum is 40.

The square root of 16672891 is about 4083.2451555105. The cubic root of 16672891 is about 255.4682719425.

The spelling of 16672891 in words is "sixteen million, six hundred seventy-two thousand, eight hundred ninety-one".