123312112 has 80 divisors (see below), whose sum is σ = 301123584. Its totient is φ = 47520000.

The previous prime is 123312107. The next prime is 123312113. The reversal of 123312112 is 211213321.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123312113) 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, 123937 + ... + 124927.

Almost surely, 2^123312112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123312112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150561792).

123312112 is an abundant number, since it is smaller than the sum of its proper divisors (177811472).

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

123312112 is a wasteful number, since it uses less digits than its factorization.

123312112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118 (or 1112 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 123312112 is about 11104.5986870305. The cubic root of 123312112 is about 497.7392763293.

Adding to 123312112 its reverse (211213321), we get a palindrome (334525433).

The spelling of 123312112 in words is "one hundred twenty-three million, three hundred twelve thousand, one hundred twelve".