2157992 has 8 divisors (see below), whose sum is σ = 4046250. Its totient is φ = 1078992.

The previous prime is 2157989. The next prime is 2158019. The reversal of 2157992 is 2997512.

It can be written as a sum of positive squares in only one way, i.e., 2149156 + 8836 = 1466^2 + 94^2 .

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, 134867 + ... + 134882.

2^2157992 is an apocalyptic number.

It is an amenable number.

2157992 is a deficient number, since it is larger than the sum of its proper divisors (1888258).

2157992 is a wasteful number, since it uses less digits than its factorization.

2157992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269755 (or 269751 counting only the distinct ones).

The product of its digits is 11340, while the sum is 35.

The square root of 2157992 is about 1469.0105513576. The cubic root of 2157992 is about 129.2260124565.

The spelling of 2157992 in words is "two million, one hundred fifty-seven thousand, nine hundred ninety-two".