243233405 has 4 divisors (see below), whose sum is σ = 291880092. Its totient is φ = 194586720.

The previous prime is 243233401. The next prime is 243233447. The reversal of 243233405 is 504332342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504332342 = 2 ⋅252166171.

It can be written as a sum of positive squares in 2 ways, for example, as 100120036 + 143113369 = 10006^2 + 11963^2 .

It is not a de Polignac number, because 243233405 - 2² = 243233401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243233401) 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, 24323336 + ... + 24323345.

It is an arithmetic number, because the mean of its divisors is an integer number (72970023).

Almost surely, 2^243233405 is an apocalyptic number.

It is an amenable number.

243233405 is a deficient number, since it is larger than the sum of its proper divisors (48646687).

243233405 is an equidigital number, since it uses as much as digits as its factorization.

243233405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48646686.

The product of its (nonzero) digits is 8640, while the sum is 26.

The square root of 243233405 is about 15595.9419401330. The cubic root of 243233405 is about 624.2248780282.

Adding to 243233405 its reverse (504332342), we get a palindrome (747565747).

The spelling of 243233405 in words is "two hundred forty-three million, two hundred thirty-three thousand, four hundred five".