16673991 has 8 divisors (see below), whose sum is σ = 23539824. Its totient is φ = 10462080.

The previous prime is 16673983. The next prime is 16673999. The reversal of 16673991 is 19937661.

It is an interprime number because it is at equal distance from previous prime (16673983) and next prime (16673999).

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

It is not a de Polignac number, because 16673991 - 2³ = 16673983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16673999) 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, 163420 + ... + 163521.

It is an arithmetic number, because the mean of its divisors is an integer number (2942478).

Almost surely, 2^16673991 is an apocalyptic number.

16673991 is a deficient number, since it is larger than the sum of its proper divisors (6865833).

16673991 is a wasteful number, since it uses less digits than its factorization.

16673991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326961.

The product of its digits is 61236, while the sum is 42.

The square root of 16673991 is about 4083.3798500752. The cubic root of 16673991 is about 255.4738900227.

The spelling of 16673991 in words is "sixteen million, six hundred seventy-three thousand, nine hundred ninety-one".