394431478943 has 2 divisors, whose sum is σ = 394431478944. Its totient is φ = 394431478942.

The previous prime is 394431478939. The next prime is 394431478967. The reversal of 394431478943 is 349874134493.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394431478943 - 2² = 394431478939 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394431478993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197215739471 + 197215739472.

It is an arithmetic number, because the mean of its divisors is an integer number (197215739472).

Almost surely, 2^394431478943 is an apocalyptic number.

394431478943 is a deficient number, since it is larger than the sum of its proper divisors (1).

394431478943 is an equidigital number, since it uses as much as digits as its factorization.

394431478943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 59.

The spelling of 394431478943 in words is "three hundred ninety-four billion, four hundred thirty-one million, four hundred seventy-eight thousand, nine hundred forty-three".