393449671 has 2 divisors, whose sum is σ = 393449672. Its totient is φ = 393449670.

The previous prime is 393449669. The next prime is 393449689. The reversal of 393449671 is 176944393.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 393449671 - 2¹ = 393449669 is a prime.

It is a super-2 number, since 2×393449671² = 309605287220016482, which contains 22 as substring.

Together with 393449669, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393449621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196724835 + 196724836.

It is an arithmetic number, because the mean of its divisors is an integer number (196724836).

Almost surely, 2^393449671 is an apocalyptic number.

393449671 is a deficient number, since it is larger than the sum of its proper divisors (1).

393449671 is an equidigital number, since it uses as much as digits as its factorization.

393449671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 46.

The square root of 393449671 is about 19835.5658099284. The cubic root of 393449671 is about 732.7622072231.

The spelling of 393449671 in words is "three hundred ninety-three million, four hundred forty-nine thousand, six hundred seventy-one".