809983 has 2 divisors, whose sum is σ = 809984. Its totient is φ = 809982.

The previous prime is 809981. The next prime is 809993. The reversal of 809983 is 389908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809983 - 2¹ = 809981 is a prime.

Together with 809981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404991 + 404992.

It is an arithmetic number, because the mean of its divisors is an integer number (404992).

2⁸⁰⁹⁹⁸³ is an apocalyptic number.

809983 is a deficient number, since it is larger than the sum of its proper divisors (1).

809983 is an equidigital number, since it uses as much as digits as its factorization.

809983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 809983 is about 899.9905555060. The cubic root of 809983 is about 93.2163230388.

The spelling of 809983 in words is "eight hundred nine thousand, nine hundred eighty-three".