394381847 has 2 divisors, whose sum is σ = 394381848. Its totient is φ = 394381846.

The previous prime is 394381831. The next prime is 394381903. The reversal of 394381847 is 748183493.

It is a weak prime.

It is an emirp because it is prime and its reverse (748183493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394381847 - 2⁴ = 394381831 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394386847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197190923 + 197190924.

It is an arithmetic number, because the mean of its divisors is an integer number (197190924).

Almost surely, 2^394381847 is an apocalyptic number.

394381847 is a deficient number, since it is larger than the sum of its proper divisors (1).

394381847 is an equidigital number, since it uses as much as digits as its factorization.

394381847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 47.

The square root of 394381847 is about 19859.0494989060. The cubic root of 394381847 is about 733.3404468777.

The spelling of 394381847 in words is "three hundred ninety-four million, three hundred eighty-one thousand, eight hundred forty-seven".