345909 has 4 divisors (see below), whose sum is σ = 461216. Its totient is φ = 230604.

The previous prime is 345907. The next prime is 345923. The reversal of 345909 is 909543.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 345909 - 2¹ = 345907 is a prime.

It is a D-number.

It is a Duffinian number.

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 345909.

It is not an unprimeable number, because it can be changed into a prime (345907) 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, 57649 + ... + 57654.

It is an arithmetic number, because the mean of its divisors is an integer number (115304).

2³⁴⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

345909 is a deficient number, since it is larger than the sum of its proper divisors (115307).

345909 is a wasteful number, since it uses less digits than its factorization.

345909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115306.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 345909 is about 588.1402893868. The cubic root of 345909 is about 70.1973343360.

The spelling of 345909 in words is "three hundred forty-five thousand, nine hundred nine".