343657 has 4 divisors (see below), whose sum is σ = 344916. Its totient is φ = 342400.

The previous prime is 343649. The next prime is 343661. The reversal of 343657 is 756343.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 331776 + 11881 = 576^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 343657 - 2³ = 343649 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (343627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28 + ... + 829.

It is an arithmetic number, because the mean of its divisors is an integer number (86229).

2³⁴³⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

343657 is a deficient number, since it is larger than the sum of its proper divisors (1259).

343657 is an equidigital number, since it uses as much as digits as its factorization.

343657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258.

The product of its digits is 7560, while the sum is 28.

The square root of 343657 is about 586.2226539464. Note that the first 3 decimals coincide. The cubic root of 343657 is about 70.0446653716.

Subtracting 343657 from its reverse (756343), we obtain a triangular number (412686 = T₉₀₈).

It can be divided in two parts, 343 and 657, that added together give a cube (1000 = 10³).

The spelling of 343657 in words is "three hundred forty-three thousand, six hundred fifty-seven".