638285983 has 2 divisors, whose sum is σ = 638285984. Its totient is φ = 638285982.

The previous prime is 638285941. The next prime is 638286007. The reversal of 638285983 is 389582836.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638285983 - 2⁹ = 638285471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638285983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638285783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319142991 + 319142992.

It is an arithmetic number, because the mean of its divisors is an integer number (319142992).

Almost surely, 2^638285983 is an apocalyptic number.

638285983 is a deficient number, since it is larger than the sum of its proper divisors (1).

638285983 is an equidigital number, since it uses as much as digits as its factorization.

638285983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 52.

The square root of 638285983 is about 25264.3223340742. The cubic root of 638285983 is about 861.0038678527.

The spelling of 638285983 in words is "six hundred thirty-eight million, two hundred eighty-five thousand, nine hundred eighty-three".