345985 has 4 divisors (see below), whose sum is σ = 415188. Its totient is φ = 276784.

The previous prime is 345979. The next prime is 345997. The reversal of 345985 is 589543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589543 = 17 ⋅34679.

It can be written as a sum of positive squares in 2 ways, for example, as 222784 + 123201 = 472^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 345985 - 2⁵ = 345953 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 345985.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34594 + ... + 34603.

It is an arithmetic number, because the mean of its divisors is an integer number (103797).

2³⁴⁵⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

345985 is a deficient number, since it is larger than the sum of its proper divisors (69203).

345985 is an equidigital number, since it uses as much as digits as its factorization.

345985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69202.

The product of its digits is 21600, while the sum is 34.

The square root of 345985 is about 588.2048962734. The cubic root of 345985 is about 70.2024750009.

The spelling of 345985 in words is "three hundred forty-five thousand, nine hundred eighty-five".