123512312 has 128 divisors (see below), whose sum is σ = 310694400. Its totient is φ = 44582400.

The previous prime is 123512309. The next prime is 123512317. The reversal of 123512312 is 213215321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123512317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 713858 + ... + 714030.

It is an arithmetic number, because the mean of its divisors is an integer number (2427300).

Almost surely, 2^123512312 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 123512312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155347200).

123512312 is an abundant number, since it is smaller than the sum of its proper divisors (187182088).

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

123512312 is a wasteful number, since it uses less digits than its factorization.

123512312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 273 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 123512312 is about 11113.6093147096. The cubic root of 123512312 is about 498.0084943418.

Adding to 123512312 its reverse (213215321), we get a palindrome (336727633).

The spelling of 123512312 in words is "one hundred twenty-three million, five hundred twelve thousand, three hundred twelve".