123042240312 has 64 divisors (see below), whose sum is σ = 313799508000. Its totient is φ = 40190152704.

The previous prime is 123042240311. The next prime is 123042240313. The reversal of 123042240312 is 213042240321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123042240311) and next prime (123042240313).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123042240311) 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, 969264 + ... + 1088832.

Almost surely, 2^123042240312 is an apocalyptic number.

123042240312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123042240312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156899754000).

123042240312 is an abundant number, since it is smaller than the sum of its proper divisors (190757267688).

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

123042240312 is a wasteful number, since it uses less digits than its factorization.

123042240312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120440 (or 120436 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 123042240312 its reverse (213042240321), we get a palindrome (336084480633).

Subtracting 123042240312 from its reverse (213042240321), we obtain a palindrome (90000000009).

The spelling of 123042240312 in words is "one hundred twenty-three billion, forty-two million, two hundred forty thousand, three hundred twelve".