345643 has 2 divisors, whose sum is σ = 345644. Its totient is φ = 345642.

The previous prime is 345637. The next prime is 345647. The reversal of 345643 is 346543.

It is a strong prime.

It is an emirp because it is prime and its reverse (346543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345643 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 3⁴ + 4 + 6⁷ + 5 + 4⁸ + 3⁴ .

345643 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (345647) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172821 + 172822.

It is an arithmetic number, because the mean of its divisors is an integer number (172822).

2³⁴⁵⁶⁴³ is an apocalyptic number.

345643 is a deficient number, since it is larger than the sum of its proper divisors (1).

345643 is an equidigital number, since it uses as much as digits as its factorization.

345643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 25.

The square root of 345643 is about 587.9141093731. The cubic root of 345643 is about 70.1793360770.

Subtracting 345643 from its reverse (346543), we obtain a square (900 = 30²).

The spelling of 345643 in words is "three hundred forty-five thousand, six hundred forty-three".