1947991882 has 8 divisors (see below), whose sum is σ = 2923965252. Its totient is φ = 973336800.

The previous prime is 1947991867. The next prime is 1947991889. The reversal of 1947991882 is 2881997491.

It can be written as a sum of positive squares in 2 ways, for example, as 1903489641 + 44502241 = 43629^2 + 6671^2 .

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 (1947991889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325869 + ... + 331792.

Almost surely, 2^1947991882 is an apocalyptic number.

1947991882 is a deficient number, since it is larger than the sum of its proper divisors (975973370).

1947991882 is a wasteful number, since it uses less digits than its factorization.

1947991882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659144.

The product of its digits is 2612736, while the sum is 58.

The square root of 1947991882 is about 44136.0610159085. The cubic root of 1947991882 is about 1248.9039740893.

The spelling of 1947991882 in words is "one billion, nine hundred forty-seven million, nine hundred ninety-one thousand, eight hundred eighty-two".