9983999 has 2 divisors, whose sum is σ = 9984000. Its totient is φ = 9983998.

The previous prime is 9983989. The next prime is 9984011. The reversal of 9983999 is 9993899.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9983999 - 2⁴ = 9983983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9983929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4991999 + 4992000.

It is an arithmetic number, because the mean of its divisors is an integer number (4992000).

Almost surely, 2^9983999 is an apocalyptic number.

9983999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9983999 is an equidigital number, since it uses as much as digits as its factorization.

9983999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1417176, while the sum is 56.

The square root of 9983999 is about 3159.7466670605. The cubic root of 9983999 is about 215.3284972944.

The spelling of 9983999 in words is "nine million, nine hundred eighty-three thousand, nine hundred ninety-nine".