16856899 has 4 divisors (see below), whose sum is σ = 16888264. Its totient is φ = 16825536.

The previous prime is 16856897. The next prime is 16856921. The reversal of 16856899 is 99865861.

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 16856899 - 2¹ = 16856897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16856893) 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, 14862 + ... + 15955.

It is an arithmetic number, because the mean of its divisors is an integer number (4222066).

Almost surely, 2^16856899 is an apocalyptic number.

16856899 is a deficient number, since it is larger than the sum of its proper divisors (31365).

16856899 is an equidigital number, since it uses as much as digits as its factorization.

16856899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31364.

The product of its digits is 933120, while the sum is 52.

The square root of 16856899 is about 4105.7154066009. The cubic root of 16856899 is about 256.4046487475.

The spelling of 16856899 in words is "sixteen million, eight hundred fifty-six thousand, eight hundred ninety-nine".