16856725 has 6 divisors (see below), whose sum is σ = 20902370. Its totient is φ = 13485360.

The previous prime is 16856717. The next prime is 16856737. The reversal of 16856725 is 52765861.

It can be written as a sum of positive squares in 3 ways, for example, as 3122289 + 13734436 = 1767^2 + 3706^2 .

It is not a de Polignac number, because 16856725 - 2³ = 16856717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 337110 + ... + 337159.

Almost surely, 2^16856725 is an apocalyptic number.

It is an amenable number.

16856725 is a deficient number, since it is larger than the sum of its proper divisors (4045645).

16856725 is an equidigital number, since it uses as much as digits as its factorization.

16856725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674279 (or 674274 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 16856725 is about 4105.6942165729. The cubic root of 16856725 is about 256.4037665259.

The spelling of 16856725 in words is "sixteen million, eight hundred fifty-six thousand, seven hundred twenty-five".