231240222 has 96 divisors (see below), whose sum is σ = 576875520. Its totient is φ = 66458880.

The previous prime is 231240199. The next prime is 231240263. The reversal of 231240222 is 222042132.

231240222 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 (18).

It is a junction number, because it is equal to n+sod(n) for n = 231240195 and 231240204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 179593 + ... + 180875.

It is an arithmetic number, because the mean of its divisors is an integer number (6009120).

Almost surely, 2^231240222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231240222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288437760).

231240222 is an abundant number, since it is smaller than the sum of its proper divisors (345635298).

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

231240222 is a wasteful number, since it uses less digits than its factorization.

231240222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 231240222 is about 15206.5848236874. The cubic root of 231240222 is about 613.7918618153.

Adding to 231240222 its reverse (222042132), we get a palindrome (453282354).

The spelling of 231240222 in words is "two hundred thirty-one million, two hundred forty thousand, two hundred twenty-two".