1982772891 has 64 divisors (see below), whose sum is σ = 3459456000. Its totient is φ = 1109687040.

The previous prime is 1982772839. The next prime is 1982772941.

1982772891 is a `hidden beast` number, since 1 + 98 + 277 + 289 + 1 = 666.

1982772891 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1982772891 - 2¹³ = 1982764699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1982772991) 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 63 ways as a sum of consecutive naturals, for example, 193095 + ... + 203103.

It is an arithmetic number, because the mean of its divisors is an integer number (54054000).

Almost surely, 2^1982772891 is an apocalyptic number.

1982772891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1982772891 is a deficient number, since it is larger than the sum of its proper divisors (1476683109).

1982772891 is a wasteful number, since it uses less digits than its factorization.

1982772891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10081 (or 10075 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 1982772891 is about 44528.3380668985. The cubic root of 1982772891 is about 1256.2931472817.

The spelling of 1982772891 in words is "one billion, nine hundred eighty-two million, seven hundred seventy-two thousand, eight hundred ninety-one".