235409 has 4 divisors (see below), whose sum is σ = 237120. Its totient is φ = 233700.

The previous prime is 235397. The next prime is 235439. The reversal of 235409 is 904532.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-235409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (235439) 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, 629 + ... + 930.

It is an arithmetic number, because the mean of its divisors is an integer number (59280).

2²³⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

235409 is a deficient number, since it is larger than the sum of its proper divisors (1711).

235409 is a wasteful number, since it uses less digits than its factorization.

235409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710.

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

The square root of 235409 is about 485.1896536407. The cubic root of 235409 is about 61.7458377652.

The spelling of 235409 in words is "two hundred thirty-five thousand, four hundred nine".