16856879 has 12 divisors (see below), whose sum is σ = 18579624. Its totient is φ = 15203184.

The previous prime is 16856869. The next prime is 16856893. The reversal of 16856879 is 97865861.

It is a happy number.

It is not a de Polignac number, because 16856879 - 2¹² = 16852783 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 (16856849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28424 + ... + 29010.

It is an arithmetic number, because the mean of its divisors is an integer number (1548302).

Almost surely, 2^16856879 is an apocalyptic number.

16856879 is a deficient number, since it is larger than the sum of its proper divisors (1722745).

16856879 is an equidigital number, since it uses as much as digits as its factorization.

16856879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 647 counting only the distinct ones).

The product of its digits is 725760, while the sum is 50.

The square root of 16856879 is about 4105.7129709711. The cubic root of 16856879 is about 256.4045473431.

The spelling of 16856879 in words is "sixteen million, eight hundred fifty-six thousand, eight hundred seventy-nine".