1981883 has 2 divisors, whose sum is σ = 1981884. Its totient is φ = 1981882.

The previous prime is 1981879. The next prime is 1981891. The reversal of 1981883 is 3881891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1981883 - 2² = 1981879 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1981813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990941 + 990942.

It is an arithmetic number, because the mean of its divisors is an integer number (990942).

2^1981883 is an apocalyptic number.

1981883 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981883 is an equidigital number, since it uses as much as digits as its factorization.

1981883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 38.

The square root of 1981883 is about 1407.7936638585. The cubic root of 1981883 is about 125.6105172945.

The spelling of 1981883 in words is "one million, nine hundred eighty-one thousand, eight hundred eighty-three".