231440222 has 32 divisors (see below), whose sum is σ = 385392000. Its totient is φ = 103576320.

The previous prime is 231440221. The next prime is 231440243. The reversal of 231440222 is 222044132.

It is a junction number, because it is equal to n+sod(n) for n = 231440194 and 231440203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231440221) 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, 114779 + ... + 116777.

It is an arithmetic number, because the mean of its divisors is an integer number (12043500).

Almost surely, 2^231440222 is an apocalyptic number.

231440222 is a deficient number, since it is larger than the sum of its proper divisors (153951778).

231440222 is a wasteful number, since it uses less digits than its factorization.

231440222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 231440222 is about 15213.1595009058. The cubic root of 231440222 is about 613.9687673107.

Adding to 231440222 its reverse (222044132), we get a palindrome (453484354).

The spelling of 231440222 in words is "two hundred thirty-one million, four hundred forty thousand, two hundred twenty-two".