345217 has 4 divisors (see below), whose sum is σ = 350020. Its totient is φ = 340416.

The previous prime is 345193. The next prime is 345221. The reversal of 345217 is 712543.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78961 + 266256 = 281^2 + 516^2 .

It is a cyclic number.

It is not a de Polignac number, because 345217 - 2⁷ = 345089 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345217.

It is not an unprimeable number, because it can be changed into a prime (345227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2292 + ... + 2437.

It is an arithmetic number, because the mean of its divisors is an integer number (87505).

2³⁴⁵²¹⁷ is an apocalyptic number.

It is an amenable number.

345217 is a deficient number, since it is larger than the sum of its proper divisors (4803).

345217 is an equidigital number, since it uses as much as digits as its factorization.

345217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4802.

The product of its digits is 840, while the sum is 22.

The square root of 345217 is about 587.5516998529. The cubic root of 345217 is about 70.1504925517.

The spelling of 345217 in words is "three hundred forty-five thousand, two hundred seventeen".