393900349 has 2 divisors, whose sum is σ = 393900350. Its totient is φ = 393900348.

The previous prime is 393900347. The next prime is 393900361. The reversal of 393900349 is 943009393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216531225 + 177369124 = 14715^2 + 13318^2 .

It is a cyclic number.

It is not a de Polignac number, because 393900349 - 2¹ = 393900347 is a prime.

Together with 393900347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393900347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196950174 + 196950175.

It is an arithmetic number, because the mean of its divisors is an integer number (196950175).

Almost surely, 2^393900349 is an apocalyptic number.

It is an amenable number.

393900349 is a deficient number, since it is larger than the sum of its proper divisors (1).

393900349 is an equidigital number, since it uses as much as digits as its factorization.

393900349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 40.

The square root of 393900349 is about 19846.9229101138. The cubic root of 393900349 is about 733.0418819559.

The spelling of 393900349 in words is "three hundred ninety-three million, nine hundred thousand, three hundred forty-nine".