394840493 has 2 divisors, whose sum is σ = 394840494. Its totient is φ = 394840492.

The previous prime is 394840469. The next prime is 394840519. The reversal of 394840493 is 394048493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375506884 + 19333609 = 19378^2 + 4397^2 .

It is an emirp because it is prime and its reverse (394048493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394840493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394840403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197420246 + 197420247.

It is an arithmetic number, because the mean of its divisors is an integer number (197420247).

Almost surely, 2^394840493 is an apocalyptic number.

It is an amenable number.

394840493 is a deficient number, since it is larger than the sum of its proper divisors (1).

394840493 is an equidigital number, since it uses as much as digits as its factorization.

394840493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 394840493 is about 19870.5936750767. The cubic root of 394840493 is about 733.6246159437.

The spelling of 394840493 in words is "three hundred ninety-four million, eight hundred forty thousand, four hundred ninety-three".