394243739 has 2 divisors, whose sum is σ = 394243740. Its totient is φ = 394243738.

The previous prime is 394243721. The next prime is 394243757. The reversal of 394243739 is 937342493.

It is a balanced prime because it is at equal distance from previous prime (394243721) and next prime (394243757).

It is a cyclic number.

It is not a de Polignac number, because 394243739 - 2¹⁶ = 394178203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394243739.

It is not a weakly prime, because it can be changed into another prime (394243789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197121869 + 197121870.

It is an arithmetic number, because the mean of its divisors is an integer number (197121870).

Almost surely, 2^394243739 is an apocalyptic number.

394243739 is a deficient number, since it is larger than the sum of its proper divisors (1).

394243739 is an equidigital number, since it uses as much as digits as its factorization.

394243739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 44.

The square root of 394243739 is about 19855.5719887391. The cubic root of 394243739 is about 733.2548344120.

The spelling of 394243739 in words is "three hundred ninety-four million, two hundred forty-three thousand, seven hundred thirty-nine".