345609 has 12 divisors (see below), whose sum is σ = 544752. Its totient is φ = 209400.

The previous prime is 345607. The next prime is 345637. The reversal of 345609 is 906543.

It is a happy number.

It is not a de Polignac number, because 345609 - 2¹ = 345607 is a prime.

It is a d-powerful number, because it can be written as 3 + 4⁸ + 6⁷ + 5³ + 0 + 9 .

It is not an unprimeable number, because it can be changed into a prime (345601) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1647 + ... + 1844.

It is an arithmetic number, because the mean of its divisors is an integer number (45396).

2³⁴⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

345609 is a deficient number, since it is larger than the sum of its proper divisors (199143).

345609 is a wasteful number, since it uses less digits than its factorization.

345609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508 (or 3505 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 345609 is about 587.8851928736. The cubic root of 345609 is about 70.1770348822.

The spelling of 345609 in words is "three hundred forty-five thousand, six hundred nine".