2161772 has 12 divisors (see below), whose sum is σ = 3796296. Its totient is φ = 1077120.

The previous prime is 2161769. The next prime is 2161777. The reversal of 2161772 is 2771612.

2161772 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2161777) 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, 647 + ... + 2177.

It is an arithmetic number, because the mean of its divisors is an integer number (316358).

2^2161772 is an apocalyptic number.

It is an amenable number.

2161772 is a deficient number, since it is larger than the sum of its proper divisors (1634524).

2161772 is a wasteful number, since it uses less digits than its factorization.

2161772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888 (or 1886 counting only the distinct ones).

The product of its digits is 1176, while the sum is 26.

The square root of 2161772 is about 1470.2965687235. The cubic root of 2161772 is about 129.3014204277.

The spelling of 2161772 in words is "two million, one hundred sixty-one thousand, seven hundred seventy-two".