2166722 has 12 divisors (see below), whose sum is σ = 3431286. Its totient is φ = 1026000.

The previous prime is 2166721. The next prime is 2166763. The reversal of 2166722 is 2276612.

It can be written as a sum of positive squares in only one way, i.e., 1819801 + 346921 = 1349^2 + 589^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2166691 and 2166700.

It is not an unprimeable number, because it can be changed into a prime (2166721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 779 + ... + 2222.

2^2166722 is an apocalyptic number.

2166722 is a deficient number, since it is larger than the sum of its proper divisors (1264564).

2166722 is a wasteful number, since it uses less digits than its factorization.

2166722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3041 (or 3022 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 2166722 is about 1471.9789400667. The cubic root of 2166722 is about 129.4000361515.

It can be divided in two parts, 21667 and 22, that multiplied together give a palindrome (476674).

The spelling of 2166722 in words is "two million, one hundred sixty-six thousand, seven hundred twenty-two".