16856972 has 12 divisors (see below), whose sum is σ = 32181576. Its totient is φ = 7662240.

The previous prime is 16856921. The next prime is 16856977. The reversal of 16856972 is 27965861.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 383113 = 16856972 / (1 + 6 + 8 + 5 + 6 + 9 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (16856977) 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, 191513 + ... + 191600.

It is an arithmetic number, because the mean of its divisors is an integer number (2681798).

Almost surely, 2^16856972 is an apocalyptic number.

It is an amenable number.

16856972 is a deficient number, since it is larger than the sum of its proper divisors (15324604).

16856972 is a wasteful number, since it uses less digits than its factorization.

16856972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383128 (or 383126 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 16856972 is about 4105.7242966376. The cubic root of 16856972 is about 256.4050188732.

Subtracting 16856972 from its reverse (27965861), we obtain a square (11108889 = 3333²).

The spelling of 16856972 in words is "sixteen million, eight hundred fifty-six thousand, nine hundred seventy-two".