16855812 has 54 divisors (see below), whose sum is σ = 45002958. Its totient is φ = 5318784.

The previous prime is 16855807. The next prime is 16855829. The reversal of 16855812 is 21855861.

It can be written as a sum of positive squares in only one way, i.e., 16842816 + 12996 = 4104^2 + 114^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12348 + ... + 13644.

Almost surely, 2^16855812 is an apocalyptic number.

16855812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16855812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22501479).

16855812 is an abundant number, since it is smaller than the sum of its proper divisors (28147146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16855812 is a wasteful number, since it uses less digits than its factorization.

16855812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345 (or 1321 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 16855812 is about 4105.5830280242. The cubic root of 16855812 is about 256.3991372980.

The spelling of 16855812 in words is "sixteen million, eight hundred fifty-five thousand, eight hundred twelve".