340891 has 4 divisors (see below), whose sum is σ = 348192. Its totient is φ = 333592.

The previous prime is 340889. The next prime is 340897. The reversal of 340891 is 198043.

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

It is a cyclic number.

It is not a de Polignac number, because 340891 - 2¹ = 340889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340897) 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, 3580 + ... + 3673.

It is an arithmetic number, because the mean of its divisors is an integer number (87048).

2³⁴⁰⁸⁹¹ is an apocalyptic number.

340891 is a deficient number, since it is larger than the sum of its proper divisors (7301).

340891 is an equidigital number, since it uses as much as digits as its factorization.

340891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7300.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 340891 is about 583.8587157866. The cubic root of 340891 is about 69.8562355542.

The spelling of 340891 in words is "three hundred forty thousand, eight hundred ninety-one".