16855799 has 4 divisors (see below), whose sum is σ = 17045280. Its totient is φ = 16666320.

The previous prime is 16855771. The next prime is 16855801. The reversal of 16855799 is 99755861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99755861 = 31 ⋅3217931.

It is a cyclic number.

It is not a de Polignac number, because 16855799 - 2²⁴ = 78583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16855739) 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, 94607 + ... + 94784.

It is an arithmetic number, because the mean of its divisors is an integer number (4261320).

Almost surely, 2^16855799 is an apocalyptic number.

16855799 is a deficient number, since it is larger than the sum of its proper divisors (189481).

16855799 is an equidigital number, since it uses as much as digits as its factorization.

16855799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189480.

The product of its digits is 680400, while the sum is 50.

The square root of 16855799 is about 4105.5814448139. The cubic root of 16855799 is about 256.3990713823.

The spelling of 16855799 in words is "sixteen million, eight hundred fifty-five thousand, seven hundred ninety-nine".