394975843 has 2 divisors, whose sum is σ = 394975844. Its totient is φ = 394975842.

The previous prime is 394975813. The next prime is 394975877. The reversal of 394975843 is 348579493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394975843 - 2⁵ = 394975811 is a prime.

It is not a weakly prime, because it can be changed into another prime (394975813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197487921 + 197487922.

It is an arithmetic number, because the mean of its divisors is an integer number (197487922).

Almost surely, 2^394975843 is an apocalyptic number.

394975843 is a deficient number, since it is larger than the sum of its proper divisors (1).

394975843 is an equidigital number, since it uses as much as digits as its factorization.

394975843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 52.

The square root of 394975843 is about 19873.9991697695. Note that the first 3 decimals coincide. The cubic root of 394975843 is about 733.7084343881.

The spelling of 394975843 in words is "three hundred ninety-four million, nine hundred seventy-five thousand, eight hundred forty-three".