343640321 has 4 divisors (see below), whose sum is σ = 343839444. Its totient is φ = 343441200.

The previous prime is 343640317. The next prime is 343640357. The reversal of 343640321 is 123046343.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105370225 + 238270096 = 10265^2 + 15436^2 .

It is a cyclic number.

It is not a de Polignac number, because 343640321 - 2² = 343640317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (343640371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96950 + ... + 100431.

It is an arithmetic number, because the mean of its divisors is an integer number (85959861).

Almost surely, 2^343640321 is an apocalyptic number.

It is an amenable number.

343640321 is a deficient number, since it is larger than the sum of its proper divisors (199123).

343640321 is a wasteful number, since it uses less digits than its factorization.

343640321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199122.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 343640321 is about 18537.5381590976. The cubic root of 343640321 is about 700.4353217394.

Adding to 343640321 its reverse (123046343), we get a palindrome (466686664).

The spelling of 343640321 in words is "three hundred forty-three million, six hundred forty thousand, three hundred twenty-one".