243407 has 4 divisors (see below), whose sum is σ = 244416. Its totient is φ = 242400.

The previous prime is 243403. The next prime is 243421. The reversal of 243407 is 704342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 243407 - 2² = 243403 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98 + ... + 704.

It is an arithmetic number, because the mean of its divisors is an integer number (61104).

2²⁴³⁴⁰⁷ is an apocalyptic number.

243407 is a deficient number, since it is larger than the sum of its proper divisors (1009).

243407 is an equidigital number, since it uses as much as digits as its factorization.

243407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 243407 is about 493.3629495615. The cubic root of 243407 is about 62.4373345229.

Adding to 243407 its reverse (704342), we get a palindrome (947749).

The spelling of 243407 in words is "two hundred forty-three thousand, four hundred seven", and thus it is an iban number.