16856919 has 12 divisors (see below), whose sum is σ = 24458200. Its totient is φ = 11187504.

The previous prime is 16856897. The next prime is 16856921. The reversal of 16856919 is 91965861.

16856919 = 532² + 533² + ... + 585².

It is not a de Polignac number, because 16856919 - 2⁸ = 16856663 is a prime.

It is a super-2 number, since 2×16856919² = 568311436345122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16852919) 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, 2029 + ... + 6150.

Almost surely, 2^16856919 is an apocalyptic number.

16856919 is a deficient number, since it is larger than the sum of its proper divisors (7601281).

16856919 is a wasteful number, since it uses less digits than its factorization.

16856919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8414 (or 8411 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 16856919 is about 4105.7178422293. The cubic root of 16856919 is about 256.4047501519.

The spelling of 16856919 in words is "sixteen million, eight hundred fifty-six thousand, nine hundred nineteen".