231243420 has 48 divisors (see below), whose sum is σ = 658465920. Its totient is φ = 60618816.

The previous prime is 231243409. The next prime is 231243421. The reversal of 231243420 is 24342132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231243421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29122 + ... + 36201.

It is an arithmetic number, because the mean of its divisors is an integer number (13718040).

Almost surely, 2^231243420 is an apocalyptic number.

231243420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231243420 is an abundant number, since it is smaller than the sum of its proper divisors (427222500).

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

231243420 is a wasteful number, since it uses less digits than its factorization.

231243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65394 (or 65392 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 231243420 is about 15206.6899751392. The cubic root of 231243420 is about 613.7946913365.

Adding to 231243420 its reverse (24342132), we get a palindrome (255585552).

The spelling of 231243420 in words is "two hundred thirty-one million, two hundred forty-three thousand, four hundred twenty".