16861122 has 80 divisors (see below), whose sum is σ = 40554360. Its totient is φ = 5225472.

The previous prime is 16861111. The next prime is 16861129. The reversal of 16861122 is 22116861.

It can be written as a sum of positive squares in 4 ways, for example, as 16329681 + 531441 = 4041^2 + 729^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861129) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 173778 + ... + 173874.

Almost surely, 2^16861122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16861122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20277180).

16861122 is an abundant number, since it is smaller than the sum of its proper divisors (23693238).

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

16861122 is a wasteful number, since it uses less digits than its factorization.

16861122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 168 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 16861122 is about 4106.2296574839. The cubic root of 16861122 is about 256.4260585063.

Adding to 16861122 its reverse (22116861), we get a palindrome (38977983).

The spelling of 16861122 in words is "sixteen million, eight hundred sixty-one thousand, one hundred twenty-two".