394213549 has 2 divisors, whose sum is σ = 394213550. Its totient is φ = 394213548.

The previous prime is 394213507. The next prime is 394213553. The reversal of 394213549 is 945312493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 325622025 + 68591524 = 18045^2 + 8282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394213549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394213249) 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, 197106774 + 197106775.

It is an arithmetic number, because the mean of its divisors is an integer number (197106775).

Almost surely, 2^394213549 is an apocalyptic number.

It is an amenable number.

394213549 is a deficient number, since it is larger than the sum of its proper divisors (1).

394213549 is an equidigital number, since it uses as much as digits as its factorization.

394213549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 394213549 is about 19854.8117341868. The cubic root of 394213549 is about 733.2361171174.

The spelling of 394213549 in words is "three hundred ninety-four million, two hundred thirteen thousand, five hundred forty-nine".