394668700831 has 2 divisors, whose sum is σ = 394668700832. Its totient is φ = 394668700830.

The previous prime is 394668700819. The next prime is 394668700873. The reversal of 394668700831 is 138007866493.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394668700831 - 2⁷ = 394668700703 is a prime.

It is a super-2 number, since 2×394668700831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394668700801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197334350415 + 197334350416.

It is an arithmetic number, because the mean of its divisors is an integer number (197334350416).

Almost surely, 2^394668700831 is an apocalyptic number.

394668700831 is a deficient number, since it is larger than the sum of its proper divisors (1).

394668700831 is an equidigital number, since it uses as much as digits as its factorization.

394668700831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 394668700831 in words is "three hundred ninety-four billion, six hundred sixty-eight million, seven hundred thousand, eight hundred thirty-one".