123031312 has 40 divisors (see below), whose sum is σ = 260554752. Its totient is φ = 56025600.

The previous prime is 123031303. The next prime is 123031331. The reversal of 123031312 is 213130321.

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

It is a zygodrome in base 5.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1137 + ... + 15727.

Almost surely, 2^123031312 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 123031312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130277376).

123031312 is an abundant number, since it is smaller than the sum of its proper divisors (137523440).

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

123031312 is a wasteful number, since it uses less digits than its factorization.

123031312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14647 (or 14641 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 123031312 is about 11091.9480705600. The cubic root of 123031312 is about 497.3611804293.

Adding to 123031312 its reverse (213130321), we get a palindrome (336161633).

Subtracting 123031312 from its reverse (213130321), we obtain a palindrome (90099009).

The spelling of 123031312 in words is "one hundred twenty-three million, thirty-one thousand, three hundred twelve".