1981736992 has 24 divisors (see below), whose sum is σ = 3975162156. Its totient is φ = 972172032.

The previous prime is 1981736987. The next prime is 1981737007. The reversal of 1981736992 is 2996371891.

It can be written as a sum of positive squares in 2 ways, for example, as 1971004816 + 10732176 = 44396^2 + 3276^2 .

It is a super-2 number, since 2×1981736992² = 7854563010922416128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582543 + ... + 585934.

Almost surely, 2^1981736992 is an apocalyptic number.

It is an amenable number.

1981736992 is an abundant number, since it is smaller than the sum of its proper divisors (1993425164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1981736992 is a wasteful number, since it uses less digits than its factorization.

1981736992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168540 (or 1168532 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 55.

The square root of 1981736992 is about 44516.7046399439. The cubic root of 1981736992 is about 1256.0743258651.

The spelling of 1981736992 in words is "one billion, nine hundred eighty-one million, seven hundred thirty-six thousand, nine hundred ninety-two".