1990847251972 has 18 divisors (see below), whose sum is σ = 3531751253534. Its totient is φ = 981775795680.

The previous prime is 1990847251951. The next prime is 1990847252021. The reversal of 1990847251972 is 2791527480991.

It can be written as a sum of positive squares in only one way, i.e., 1745400330496 + 245446921476 = 1321136^2 + 495426^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24069447 + ... + 24152017.

Almost surely, 2^{1990847251972} is an apocalyptic number.

It is an amenable number.

1990847251972 is a deficient number, since it is larger than the sum of its proper divisors (1540904001562).

1990847251972 is an frugal number, since it uses more digits than its factorization.

1990847251972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165219 (or 82646 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 64.

The spelling of 1990847251972 in words is "one trillion, nine hundred ninety billion, eight hundred forty-seven million, two hundred fifty-one thousand, nine hundred seventy-two".