342509 has 4 divisors (see below), whose sum is σ = 351804. Its totient is φ = 333216.

The previous prime is 342497. The next prime is 342521. The reversal of 342509 is 905243.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905243 = 113 ⋅8011.

It is an interprime number because it is at equal distance from previous prime (342497) and next prime (342521).

It can be written as a sum of positive squares in 2 ways, for example, as 157609 + 184900 = 397^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 342509 - 2¹² = 338413 is a prime.

It is a Duffinian number.

It is a Curzon 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 342509.

It is not an unprimeable number, because it can be changed into a prime (342569) 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, 4592 + ... + 4665.

It is an arithmetic number, because the mean of its divisors is an integer number (87951).

2³⁴²⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

342509 is a deficient number, since it is larger than the sum of its proper divisors (9295).

342509 is an equidigital number, since it uses as much as digits as its factorization.

342509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9294.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 342509 is about 585.2426847044. The cubic root of 342509 is about 69.9665826889.

The spelling of 342509 in words is "three hundred forty-two thousand, five hundred nine".