19983881 has 2 divisors, whose sum is σ = 19983882. Its totient is φ = 19983880.

The previous prime is 19983853. The next prime is 19983893. The reversal of 19983881 is 18838991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13808656 + 6175225 = 3716^2 + 2485^2 .

It is a cyclic number.

It is not a de Polignac number, because 19983881 - 2²² = 15789577 is a prime.

It is a super-2 number, since 2×19983881² = 798710999644322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19983281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9991940 + 9991941.

It is an arithmetic number, because the mean of its divisors is an integer number (9991941).

Almost surely, 2^19983881 is an apocalyptic number.

It is an amenable number.

19983881 is a deficient number, since it is larger than the sum of its proper divisors (1).

19983881 is an equidigital number, since it uses as much as digits as its factorization.

19983881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 47.

The square root of 19983881 is about 4470.3334327542. Note that the first 3 decimals coincide. The cubic root of 19983881 is about 271.3688192307.

The spelling of 19983881 in words is "nineteen million, nine hundred eighty-three thousand, eight hundred eighty-one".