394095643 has 2 divisors, whose sum is σ = 394095644. Its totient is φ = 394095642.

The previous prime is 394095623. The next prime is 394095661. The reversal of 394095643 is 346590493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394095643 - 2²¹ = 391998491 is a prime.

It is a super-2 number, since 2×394095643² = 310622751663166898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 394095643.

It is not a weakly prime, because it can be changed into another prime (394095623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197047821 + 197047822.

It is an arithmetic number, because the mean of its divisors is an integer number (197047822).

Almost surely, 2^394095643 is an apocalyptic number.

394095643 is a deficient number, since it is larger than the sum of its proper divisors (1).

394095643 is an equidigital number, since it uses as much as digits as its factorization.

394095643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 43.

The square root of 394095643 is about 19851.8423074535. The cubic root of 394095643 is about 733.1630082163.

The spelling of 394095643 in words is "three hundred ninety-four million, ninety-five thousand, six hundred forty-three".