840005983 has 2 divisors, whose sum is σ = 840005984. Its totient is φ = 840005982.

The previous prime is 840005927. The next prime is 840005987. The reversal of 840005983 is 389500048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840005983 - 2¹⁷ = 839874911 is a prime.

It is a super-2 number, since 2×840005983² = 1411220102951592578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840005987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420002991 + 420002992.

It is an arithmetic number, because the mean of its divisors is an integer number (420002992).

Almost surely, 2^840005983 is an apocalyptic number.

840005983 is a deficient number, since it is larger than the sum of its proper divisors (1).

840005983 is an equidigital number, since it uses as much as digits as its factorization.

840005983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 840005983 is about 28982.8567087511. The cubic root of 840005983 is about 943.5410362138.

The spelling of 840005983 in words is "eight hundred forty million, five thousand, nine hundred eighty-three".