1982881 has 2 divisors, whose sum is σ = 1982882. Its totient is φ = 1982880.

The previous prime is 1982879. The next prime is 1982887. The reversal of 1982881 is 1882891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032256 + 950625 = 1016^2 + 975^2 .

It is an emirp because it is prime and its reverse (1882891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1982881 - 2¹ = 1982879 is a prime.

It is a super-2 number, since 2×1982881² = 7863634120322, which contains 22 as substring.

Together with 1982879, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1982881.

It is not a weakly prime, because it can be changed into another prime (1982887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991440 + 991441.

It is an arithmetic number, because the mean of its divisors is an integer number (991441).

2^1982881 is an apocalyptic number.

It is an amenable number.

1982881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982881 is an equidigital number, since it uses as much as digits as its factorization.

1982881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 37.

The square root of 1982881 is about 1408.1480746001. The cubic root of 1982881 is about 125.6315979637.

The spelling of 1982881 in words is "one million, nine hundred eighty-two thousand, eight hundred eighty-one".