343691 has 4 divisors (see below), whose sum is σ = 361800. Its totient is φ = 325584.

The previous prime is 343687. The next prime is 343709. The reversal of 343691 is 196343.

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

It is not a de Polignac number, because 343691 - 2² = 343687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 343691.

It is not an unprimeable number, because it can be changed into a prime (343601) 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, 9026 + ... + 9063.

It is an arithmetic number, because the mean of its divisors is an integer number (90450).

2³⁴³⁶⁹¹ is an apocalyptic number.

343691 is a deficient number, since it is larger than the sum of its proper divisors (18109).

343691 is a wasteful number, since it uses less digits than its factorization.

343691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18108.

The product of its digits is 1944, while the sum is 26.

The square root of 343691 is about 586.2516524497. The cubic root of 343691 is about 70.0469752717.

The spelling of 343691 in words is "three hundred forty-three thousand, six hundred ninety-one".