2161722 has 8 divisors (see below), whose sum is σ = 4323456. Its totient is φ = 720572.

The previous prime is 2161699. The next prime is 2161729. The reversal of 2161722 is 2271612.

2161722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

2161722 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2161729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180138 + ... + 180149.

It is an arithmetic number, because the mean of its divisors is an integer number (540432).

2^2161722 is an apocalyptic number.

2161722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2161722 is a wasteful number, since it uses less digits than its factorization.

2161722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360292.

The product of its digits is 336, while the sum is 21.

The square root of 2161722 is about 1470.2795652528. The cubic root of 2161722 is about 129.3004235416.

It can be divided in two parts, 21617 and 22, that multiplied together give a palindrome (475574).

The spelling of 2161722 in words is "two million, one hundred sixty-one thousand, seven hundred twenty-two".