343400657 has 2 divisors, whose sum is σ = 343400658. Its totient is φ = 343400656.

The previous prime is 343400627. The next prime is 343400669. The reversal of 343400657 is 756004343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306810256 + 36590401 = 17516^2 + 6049^2 .

It is an emirp because it is prime and its reverse (756004343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343400657 - 2¹² = 343396561 is a prime.

It is a super-2 number, since 2×343400657² = 235848022456063298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (343400627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171700328 + 171700329.

It is an arithmetic number, because the mean of its divisors is an integer number (171700329).

Almost surely, 2^343400657 is an apocalyptic number.

It is an amenable number.

343400657 is a deficient number, since it is larger than the sum of its proper divisors (1).

343400657 is an equidigital number, since it uses as much as digits as its factorization.

343400657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 343400657 is about 18531.0727428285. The cubic root of 343400657 is about 700.2724497273.

The spelling of 343400657 in words is "three hundred forty-three million, four hundred thousand, six hundred fifty-seven".