16856145 has 24 divisors (see below), whose sum is σ = 29405376. Its totient is φ = 8932128.

The previous prime is 16856137. The next prime is 16856149. The reversal of 16856145 is 54165861.

It is not a de Polignac number, because 16856145 - 2³ = 16856137 is a prime.

It is a super-2 number, since 2×16856145² = 568259248522050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16856149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6394 + ... + 8636.

It is an arithmetic number, because the mean of its divisors is an integer number (1225224).

Almost surely, 2^16856145 is an apocalyptic number.

16856145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16856145 is a deficient number, since it is larger than the sum of its proper divisors (12549231).

16856145 is a wasteful number, since it uses less digits than its factorization.

16856145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421 (or 2418 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 16856145 is about 4105.6235823563. The cubic root of 16856145 is about 256.4008257433.

The spelling of 16856145 in words is "sixteen million, eight hundred fifty-six thousand, one hundred forty-five".