343339621 has 4 divisors (see below), whose sum is σ = 343793932. Its totient is φ = 342885312.

The previous prime is 343339583. The next prime is 343339627. The reversal of 343339621 is 126933343.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126933343 = 23 ⋅5518841.

It can be written as a sum of positive squares in 2 ways, for example, as 248062500 + 95277121 = 15750^2 + 9761^2 .

It is a cyclic number.

It is not a de Polignac number, because 343339621 - 2⁹ = 343339109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343339627) 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, 226020 + ... + 227533.

It is an arithmetic number, because the mean of its divisors is an integer number (85948483).

Almost surely, 2^343339621 is an apocalyptic number.

It is an amenable number.

343339621 is a deficient number, since it is larger than the sum of its proper divisors (454311).

343339621 is an equidigital number, since it uses as much as digits as its factorization.

343339621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454310.

The product of its digits is 34992, while the sum is 34.

The square root of 343339621 is about 18529.4258140936. The cubic root of 343339621 is about 700.2309584829.

The spelling of 343339621 in words is "three hundred forty-three million, three hundred thirty-nine thousand, six hundred twenty-one".