349913857 has 2 divisors, whose sum is σ = 349913858. Its totient is φ = 349913856.

The previous prime is 349913849. The next prime is 349913869. The reversal of 349913857 is 758319943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308388721 + 41525136 = 17561^2 + 6444^2 .

It is an emirp because it is prime and its reverse (758319943) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 349913857 - 2³ = 349913849 is a prime.

It is a Chen prime.

It is equal to p_18799078 and since 349913857 and 18799078 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 349913857.

It is not a weakly prime, because it can be changed into another prime (349913827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174956928 + 174956929.

It is an arithmetic number, because the mean of its divisors is an integer number (174956929).

Almost surely, 2^349913857 is an apocalyptic number.

It is an amenable number.

349913857 is a deficient number, since it is larger than the sum of its proper divisors (1).

349913857 is an equidigital number, since it uses as much as digits as its factorization.

349913857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 349913857 is about 18705.9845236758. The cubic root of 349913857 is about 704.6720517525.

The spelling of 349913857 in words is "three hundred forty-nine million, nine hundred thirteen thousand, eight hundred fifty-seven".