999789983 has 2 divisors, whose sum is σ = 999789984. Its totient is φ = 999789982.

The previous prime is 999789953. The next prime is 999790027. The reversal of 999789983 is 389987999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999789983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999789953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499894991 + 499894992.

It is an arithmetic number, because the mean of its divisors is an integer number (499894992).

Almost surely, 2^999789983 is an apocalyptic number.

999789983 is a deficient number, since it is larger than the sum of its proper divisors (1).

999789983 is an equidigital number, since it uses as much as digits as its factorization.

999789983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79361856, while the sum is 71.

The square root of 999789983 is about 31619.4557669799. The cubic root of 999789983 is about 999.9299894320.

The spelling of 999789983 in words is "nine hundred ninety-nine million, seven hundred eighty-nine thousand, nine hundred eighty-three".