839618993 has 2 divisors, whose sum is σ = 839618994. Its totient is φ = 839618992.

The previous prime is 839618981. The next prime is 839619019. The reversal of 839618993 is 399816938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831284224 + 8334769 = 28832^2 + 2887^2 .

It is a cyclic number.

It is not a de Polignac number, because 839618993 - 2⁸ = 839618737 is a prime.

It is not a weakly prime, because it can be changed into another prime (839618093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419809496 + 419809497.

It is an arithmetic number, because the mean of its divisors is an integer number (419809497).

Almost surely, 2^839618993 is an apocalyptic number.

It is an amenable number.

839618993 is a deficient number, since it is larger than the sum of its proper divisors (1).

839618993 is an equidigital number, since it uses as much as digits as its factorization.

839618993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 56.

The square root of 839618993 is about 28976.1797516512. The cubic root of 839618993 is about 943.3961177883.

The spelling of 839618993 in words is "eight hundred thirty-nine million, six hundred eighteen thousand, nine hundred ninety-three".