394047287 has 2 divisors, whose sum is σ = 394047288. Its totient is φ = 394047286.

The previous prime is 394047259. The next prime is 394047343. The reversal of 394047287 is 782740493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394047287 - 2⁶ = 394047223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394047487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197023643 + 197023644.

It is an arithmetic number, because the mean of its divisors is an integer number (197023644).

Almost surely, 2^394047287 is an apocalyptic number.

394047287 is a deficient number, since it is larger than the sum of its proper divisors (1).

394047287 is an equidigital number, since it uses as much as digits as its factorization.

394047287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 394047287 is about 19850.6243478637. The cubic root of 394047287 is about 733.1330203346.

The spelling of 394047287 in words is "three hundred ninety-four million, forty-seven thousand, two hundred eighty-seven".