233409 has 12 divisors (see below), whose sum is σ = 342608. Its totient is φ = 141240.

The previous prime is 233407. The next prime is 233417. The reversal of 233409 is 904332.

It is not a de Polignac number, because 233409 - 2¹ = 233407 is a prime.

It is a super-2 number, since 2×233409² = 108959522562, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (233407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42 + ... + 684.

2²³³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

233409 is a deficient number, since it is larger than the sum of its proper divisors (109199).

233409 is a wasteful number, since it uses less digits than its factorization.

233409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 233409 is about 483.1242076320. The cubic root of 233409 is about 61.5704790520.

It can be divided in two parts, 2 and 33409, that added together give a triangular number (33411 = T₂₅₈).

The spelling of 233409 in words is "two hundred thirty-three thousand, four hundred nine".