2165992 has 8 divisors (see below), whose sum is σ = 4061250. Its totient is φ = 1082992.

The previous prime is 2165971. The next prime is 2166007. The reversal of 2165992 is 2995612.

It can be written as a sum of positive squares in only one way, i.e., 2090916 + 75076 = 1446^2 + 274^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135367 + ... + 135382.

2^2165992 is an apocalyptic number.

It is an amenable number.

2165992 is a deficient number, since it is larger than the sum of its proper divisors (1895258).

2165992 is a wasteful number, since it uses less digits than its factorization.

2165992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270755 (or 270751 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 2165992 is about 1471.7309536733. The cubic root of 2165992 is about 129.3855022708.

Adding to 2165992 its product of digits (9720), we get a palindrome (2175712).

The spelling of 2165992 in words is "two million, one hundred sixty-five thousand, nine hundred ninety-two".