243212423 has 4 divisors (see below), whose sum is σ = 243256008. Its totient is φ = 243168840.

The previous prime is 243212413. The next prime is 243212441. The reversal of 243212423 is 324212342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243212423 - 2¹² = 243208327 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 (243212413) 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, 11936 + ... + 25077.

It is an arithmetic number, because the mean of its divisors is an integer number (60814002).

Almost surely, 2^243212423 is an apocalyptic number.

243212423 is a deficient number, since it is larger than the sum of its proper divisors (43585).

243212423 is an equidigital number, since it uses as much as digits as its factorization.

243212423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43584.

The product of its digits is 2304, while the sum is 23.

The square root of 243212423 is about 15595.2692506414. The cubic root of 243212423 is about 624.2069283788.

Adding to 243212423 its reverse (324212342), we get a palindrome (567424765).

The spelling of 243212423 in words is "two hundred forty-three million, two hundred twelve thousand, four hundred twenty-three".