392806993 has 2 divisors, whose sum is σ = 392806994. Its totient is φ = 392806992.

The previous prime is 392806991. The next prime is 392807071. The reversal of 392806993 is 399608293.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252905409 + 139901584 = 15903^2 + 11828^2 .

It is a cyclic number.

It is not a de Polignac number, because 392806993 - 2¹ = 392806991 is a prime.

Together with 392806991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (392806991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196403496 + 196403497.

It is an arithmetic number, because the mean of its divisors is an integer number (196403497).

Almost surely, 2^392806993 is an apocalyptic number.

It is an amenable number.

392806993 is a deficient number, since it is larger than the sum of its proper divisors (1).

392806993 is an equidigital number, since it uses as much as digits as its factorization.

392806993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 392806993 is about 19819.3590461448. The cubic root of 392806993 is about 732.3630144503.

The spelling of 392806993 in words is "three hundred ninety-two million, eight hundred six thousand, nine hundred ninety-three".