123222222 has 80 divisors (see below), whose sum is σ = 295911792. Its totient is φ = 38188800.

The previous prime is 123222217. The next prime is 123222223. The reversal of 123222222 is 222222321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

123222222 is a modest number, since divided by 22222 gives 1232 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 123222195 and 123222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123222223) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 277933 + ... + 278375.

Almost surely, 2^123222222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147955896).

123222222 is an abundant number, since it is smaller than the sum of its proper divisors (172689570).

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

123222222 is a wasteful number, since it uses less digits than its factorization.

123222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 566 counting only the distinct ones).

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

The square root of 123222222 is about 11100.5505268883. The cubic root of 123222222 is about 497.6183023797.

Adding to 123222222 its reverse (222222321), we get a palindrome (345444543).

Subtracting 123222222 from its reverse (222222321), we obtain a palindrome (99000099).

The spelling of 123222222 in words is "one hundred twenty-three million, two hundred twenty-two thousand, two hundred twenty-two".