393042478771 has 2 divisors, whose sum is σ = 393042478772. Its totient is φ = 393042478770.

The previous prime is 393042478739. The next prime is 393042478781. The reversal of 393042478771 is 177874240393.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 393042478771 - 2⁵ = 393042478739 is a prime.

It is not a weakly prime, because it can be changed into another prime (393042478781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196521239385 + 196521239386.

It is an arithmetic number, because the mean of its divisors is an integer number (196521239386).

Almost surely, 2^393042478771 is an apocalyptic number.

393042478771 is a deficient number, since it is larger than the sum of its proper divisors (1).

393042478771 is an equidigital number, since it uses as much as digits as its factorization.

393042478771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7112448, while the sum is 55.

The spelling of 393042478771 in words is "three hundred ninety-three billion, forty-two million, four hundred seventy-eight thousand, seven hundred seventy-one".