243431320 has 32 divisors (see below), whose sum is σ = 597514320. Its totient is φ = 88520320.

The previous prime is 243431303. The next prime is 243431323. The reversal of 243431320 is 23134342.

It is a happy number.

243431320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 243431291 and 243431300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243431323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276187 + ... + 277066.

Almost surely, 2^243431320 is an apocalyptic number.

243431320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243431320 is an abundant number, since it is smaller than the sum of its proper divisors (354083000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243431320 is a wasteful number, since it uses less digits than its factorization.

243431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553275 (or 553271 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 243431320 is about 15602.2857299820. The cubic root of 243431320 is about 624.3941392822.

Adding to 243431320 its reverse (23134342), we get a palindrome (266565662).

The spelling of 243431320 in words is "two hundred forty-three million, four hundred thirty-one thousand, three hundred twenty".