394533889 has 2 divisors, whose sum is σ = 394533890. Its totient is φ = 394533888.

The previous prime is 394533883. The next prime is 394533899. The reversal of 394533889 is 988335493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317445489 + 77088400 = 17817^2 + 8780^2 .

It is an emirp because it is prime and its reverse (988335493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394533889 - 2⁷ = 394533761 is a prime.

It is not a weakly prime, because it can be changed into another prime (394533883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197266944 + 197266945.

It is an arithmetic number, because the mean of its divisors is an integer number (197266945).

Almost surely, 2^394533889 is an apocalyptic number.

It is an amenable number.

394533889 is a deficient number, since it is larger than the sum of its proper divisors (1).

394533889 is an equidigital number, since it uses as much as digits as its factorization.

394533889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 52.

The square root of 394533889 is about 19862.8771581561. The cubic root of 394533889 is about 733.4346738508.

The spelling of 394533889 in words is "three hundred ninety-four million, five hundred thirty-three thousand, eight hundred eighty-nine".