842863993 has 2 divisors, whose sum is σ = 842863994. Its totient is φ = 842863992.

The previous prime is 842863979. The next prime is 842864039. The reversal of 842863993 is 399368248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828748944 + 14115049 = 28788^2 + 3757^2 .

It is a cyclic number.

It is not a de Polignac number, because 842863993 - 2²⁵ = 809309561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 842863993.

It is not a weakly prime, because it can be changed into another prime (842863963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421431996 + 421431997.

It is an arithmetic number, because the mean of its divisors is an integer number (421431997).

Almost surely, 2^842863993 is an apocalyptic number.

It is an amenable number.

842863993 is a deficient number, since it is larger than the sum of its proper divisors (1).

842863993 is an equidigital number, since it uses as much as digits as its factorization.

842863993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 52.

The square root of 842863993 is about 29032.1200224854. The cubic root of 842863993 is about 944.6099163595.

The spelling of 842863993 in words is "eight hundred forty-two million, eight hundred sixty-three thousand, nine hundred ninety-three".