392638993 has 2 divisors, whose sum is σ = 392638994. Its totient is φ = 392638992.

The previous prime is 392638991. The next prime is 392639057. The reversal of 392638993 is 399836293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376049664 + 16589329 = 19392^2 + 4073^2 .

It is a cyclic number.

It is not a de Polignac number, because 392638993 - 2¹ = 392638991 is a prime.

Together with 392638991, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 392638993.

It is not a weakly prime, because it can be changed into another prime (392638991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196319496 + 196319497.

It is an arithmetic number, because the mean of its divisors is an integer number (196319497).

Almost surely, 2^392638993 is an apocalyptic number.

It is an amenable number.

392638993 is a deficient number, since it is larger than the sum of its proper divisors (1).

392638993 is an equidigital number, since it uses as much as digits as its factorization.

392638993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 52.

The square root of 392638993 is about 19815.1203125290. The cubic root of 392638993 is about 732.2585912149.

The spelling of 392638993 in words is "three hundred ninety-two million, six hundred thirty-eight thousand, nine hundred ninety-three".