399959983 has 2 divisors, whose sum is σ = 399959984. Its totient is φ = 399959982.

The previous prime is 399959953. The next prime is 399960007. The reversal of 399959983 is 389959993.

It is a strong prime.

It is an emirp because it is prime and its reverse (389959993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399959983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399959953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199979991 + 199979992.

It is an arithmetic number, because the mean of its divisors is an integer number (199979992).

Almost surely, 2^399959983 is an apocalyptic number.

399959983 is a deficient number, since it is larger than the sum of its proper divisors (1).

399959983 is an equidigital number, since it uses as much as digits as its factorization.

399959983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21257640, while the sum is 64.

The square root of 399959983 is about 19998.9995499775. Note that the first 3 decimals coincide. The cubic root of 399959983 is about 736.7817282606.

The spelling of 399959983 in words is "three hundred ninety-nine million, nine hundred fifty-nine thousand, nine hundred eighty-three".