394043249 has 2 divisors, whose sum is σ = 394043250. Its totient is φ = 394043248.

The previous prime is 394043233. The next prime is 394043341. The reversal of 394043249 is 942340493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374151649 + 19891600 = 19343^2 + 4460^2 .

It is an emirp because it is prime and its reverse (942340493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394043249 - 2⁴ = 394043233 is a prime.

It is not a weakly prime, because it can be changed into another prime (394043219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197021624 + 197021625.

It is an arithmetic number, because the mean of its divisors is an integer number (197021625).

Almost surely, 2^394043249 is an apocalyptic number.

It is an amenable number.

394043249 is a deficient number, since it is larger than the sum of its proper divisors (1).

394043249 is an equidigital number, since it uses as much as digits as its factorization.

394043249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 394043249 is about 19850.5226379559. The cubic root of 394043249 is about 733.1305160656.

The spelling of 394043249 in words is "three hundred ninety-four million, forty-three thousand, two hundred forty-nine".