16808399 has 4 divisors (see below), whose sum is σ = 17199336. Its totient is φ = 16417464.

The previous prime is 16808381. The next prime is 16808419. The reversal of 16808399 is 99380861.

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 16808399 - 2²⁰ = 15759823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16808339) 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, 195404 + ... + 195489.

It is an arithmetic number, because the mean of its divisors is an integer number (4299834).

Almost surely, 2^16808399 is an apocalyptic number.

16808399 is a deficient number, since it is larger than the sum of its proper divisors (390937).

16808399 is an equidigital number, since it uses as much as digits as its factorization.

16808399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390936.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 16808399 is about 4099.8047514485. The cubic root of 16808399 is about 256.1585067773.

The spelling of 16808399 in words is "sixteen million, eight hundred eight thousand, three hundred ninety-nine".