345745 has 4 divisors (see below), whose sum is σ = 414900. Its totient is φ = 276592.

The previous prime is 345739. The next prime is 345749. The reversal of 345745 is 547543.

It is a Cunningham number, because it is equal to 588²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547543 = 53 ⋅10331.

It can be written as a sum of positive squares in 2 ways, for example, as 123904 + 221841 = 352^2 + 471^2 .

It is a cyclic number.

It is not a de Polignac number, because 345745 - 2¹⁷ = 214673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (345749) 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, 34570 + ... + 34579.

It is an arithmetic number, because the mean of its divisors is an integer number (103725).

2³⁴⁵⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

345745 is a deficient number, since it is larger than the sum of its proper divisors (69155).

345745 is an equidigital number, since it uses as much as digits as its factorization.

345745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69154.

The product of its digits is 8400, while the sum is 28.

The square root of 345745 is about 588.0008503395. Note that the first 3 decimals coincide. The cubic root of 345745 is about 70.1862387562.

The spelling of 345745 in words is "three hundred forty-five thousand, seven hundred forty-five".