1995821937 has 28 divisors (see below), whose sum is σ = 3019937140. Its totient is φ = 1318288608.

The previous prime is 1995821797. The next prime is 1995821953. The reversal of 1995821937 is 7391285991.

1995821937 is a `hidden beast` number, since 19 + 9 + 582 + 19 + 37 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1285652736 + 710169201 = 35856^2 + 26649^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1995821937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1995821957) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 66903 + ... + 92019.

Almost surely, 2^1995821937 is an apocalyptic number.

It is an amenable number.

1995821937 is a deficient number, since it is larger than the sum of its proper divisors (1024115203).

1995821937 is an equidigital number, since it uses as much as digits as its factorization.

1995821937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25244 (or 25229 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 1995821937 is about 44674.6229642736. The cubic root of 1995821937 is about 1259.0431000022.

The spelling of 1995821937 in words is "one billion, nine hundred ninety-five million, eight hundred twenty-one thousand, nine hundred thirty-seven".