243423653 has 4 divisors (see below), whose sum is σ = 265553088. Its totient is φ = 221294220.

The previous prime is 243423637. The next prime is 243423667. The reversal of 243423653 is 356324342.

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 not a de Polignac number, because 243423653 - 2⁴ = 243423637 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 (243422653) 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, 11064701 + ... + 11064722.

It is an arithmetic number, because the mean of its divisors is an integer number (66388272).

Almost surely, 2^243423653 is an apocalyptic number.

It is an amenable number.

243423653 is a deficient number, since it is larger than the sum of its proper divisors (22129435).

243423653 is a wasteful number, since it uses less digits than its factorization.

243423653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22129434.

The product of its digits is 51840, while the sum is 32.

The square root of 243423653 is about 15602.0400268683. The cubic root of 243423653 is about 624.3875840040.

Adding to 243423653 its reverse (356324342), we get a palindrome (599747995).

The spelling of 243423653 in words is "two hundred forty-three million, four hundred twenty-three thousand, six hundred fifty-three".