16923891 has 8 divisors (see below), whose sum is σ = 23892624. Its totient is φ = 10618880.

The previous prime is 16923877. The next prime is 16923899. The reversal of 16923891 is 19832961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16923891 - 2⁵ = 16923859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16923899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165870 + ... + 165971.

It is an arithmetic number, because the mean of its divisors is an integer number (2986578).

Almost surely, 2^16923891 is an apocalyptic number.

16923891 is a deficient number, since it is larger than the sum of its proper divisors (6968733).

16923891 is a wasteful number, since it uses less digits than its factorization.

16923891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331861.

The product of its digits is 23328, while the sum is 39.

The square root of 16923891 is about 4113.8657002873. The cubic root of 16923891 is about 256.7438640750.

The spelling of 16923891 in words is "sixteen million, nine hundred twenty-three thousand, eight hundred ninety-one".