394813439 has 2 divisors, whose sum is σ = 394813440. Its totient is φ = 394813438.

The previous prime is 394813429. The next prime is 394813493. The reversal of 394813439 is 934318493.

Together with next prime (394813493) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394813439 - 2²⁴ = 378036223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394813439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394813429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197406719 + 197406720.

It is an arithmetic number, because the mean of its divisors is an integer number (197406720).

Almost surely, 2^394813439 is an apocalyptic number.

394813439 is a deficient number, since it is larger than the sum of its proper divisors (1).

394813439 is an equidigital number, since it uses as much as digits as its factorization.

394813439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The square root of 394813439 is about 19869.9129087170. The cubic root of 394813439 is about 733.6078598662.

The spelling of 394813439 in words is "three hundred ninety-four million, eight hundred thirteen thousand, four hundred thirty-nine".