340643 has 2 divisors, whose sum is σ = 340644. Its totient is φ = 340642.

The previous prime is 340633. The next prime is 340649. The reversal of 340643 is 346043.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (346043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340643 - 2⁶ = 340579 is a prime.

It is equal to p₂₉₂₃₄ and since 340643 and 29234 have the same sum of digits, it is a Honaker prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 340643.

It is not a weakly prime, because it can be changed into another prime (340649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170321 + 170322.

It is an arithmetic number, because the mean of its divisors is an integer number (170322).

2³⁴⁰⁶⁴³ is an apocalyptic number.

340643 is a deficient number, since it is larger than the sum of its proper divisors (1).

340643 is an equidigital number, since it uses as much as digits as its factorization.

340643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 340643 is about 583.6462969984. The cubic root of 340643 is about 69.8392911845.

Adding to 340643 its reverse (346043), we get a palindrome (686686).

The spelling of 340643 in words is "three hundred forty thousand, six hundred forty-three".