16851816 has 48 divisors (see below), whose sum is σ = 46425600. Its totient is φ = 5520672.

The previous prime is 16851787. The next prime is 16851833. The reversal of 16851816 is 61815861.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2265 + ... + 6231.

It is an arithmetic number, because the mean of its divisors is an integer number (967200).

Almost surely, 2^16851816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16851816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23212800).

16851816 is an abundant number, since it is smaller than the sum of its proper divisors (29573784).

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

16851816 is a wasteful number, since it uses less digits than its factorization.

16851816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4038 (or 4031 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 16851816 is about 4105.0963447890. The cubic root of 16851816 is about 256.3788742194.

It can be divided in two parts, 168 and 51816, that added together give a square (51984 = 228²).

The spelling of 16851816 in words is "sixteen million, eight hundred fifty-one thousand, eight hundred sixteen".