1971985922 has 8 divisors (see below), whose sum is σ = 2959317372. Its totient is φ = 985546800.

The previous prime is 1971985921. The next prime is 1971985931. The reversal of 1971985922 is 2295891791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1851666961 + 120318961 = 43031^2 + 10969^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1971985921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217529 + ... + 226412.

Almost surely, 2^1971985922 is an apocalyptic number.

1971985922 is a deficient number, since it is larger than the sum of its proper divisors (987331450).

1971985922 is a wasteful number, since it uses less digits than its factorization.

1971985922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446164.

The product of its digits is 816480, while the sum is 53.

The square root of 1971985922 is about 44407.0481117581. The cubic root of 1971985922 is about 1254.0107805078.

The spelling of 1971985922 in words is "one billion, nine hundred seventy-one million, nine hundred eighty-five thousand, nine hundred twenty-two".