989979983 has 2 divisors, whose sum is σ = 989979984. Its totient is φ = 989979982.

The previous prime is 989979929. The next prime is 989980003. The reversal of 989979983 is 389979989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989979983 - 2¹⁰ = 989978959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989979923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494989991 + 494989992.

It is an arithmetic number, because the mean of its divisors is an integer number (494989992).

Almost surely, 2^989979983 is an apocalyptic number.

989979983 is a deficient number, since it is larger than the sum of its proper divisors (1).

989979983 is an equidigital number, since it uses as much as digits as its factorization.

989979983 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 989979983 is about 31463.9473524858. The cubic root of 989979983 is about 996.6487761778.

The spelling of 989979983 in words is "nine hundred eighty-nine million, nine hundred seventy-nine thousand, nine hundred eighty-three".