345665 has 8 divisors (see below), whose sum is σ = 417960. Its totient is φ = 274432.

The previous prime is 345659. The next prime is 345673. The reversal of 345665 is 566543.

It can be written as a sum of positive squares in 4 ways, for example, as 49729 + 295936 = 223^2 + 544^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 345665 - 2⁶ = 345601 is a prime.

It is a d-powerful number, because it can be written as 3³ + 4⁸ + 6² + 5 + 6⁷ + 5³ .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1151 + ... + 1419.

It is an arithmetic number, because the mean of its divisors is an integer number (52245).

2³⁴⁵⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

345665 is a deficient number, since it is larger than the sum of its proper divisors (72295).

345665 is a wasteful number, since it uses less digits than its factorization.

345665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531.

The product of its digits is 10800, while the sum is 29.

The square root of 345665 is about 587.9328192915. The cubic root of 345665 is about 70.1808250050.

The spelling of 345665 in words is "three hundred forty-five thousand, six hundred sixty-five".