123440312 has 16 divisors (see below), whose sum is σ = 232491840. Its totient is φ = 61442496.

The previous prime is 123440279. The next prime is 123440323. The reversal of 123440312 is 213044321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32813 + ... + 36380.

It is an arithmetic number, because the mean of its divisors is an integer number (14530740).

Almost surely, 2^123440312 is an apocalyptic number.

It is an amenable number.

123440312 is a deficient number, since it is larger than the sum of its proper divisors (109051528).

123440312 is a wasteful number, since it uses less digits than its factorization.

123440312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69422 (or 69418 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 123440312 is about 11110.3695708109. The cubic root of 123440312 is about 497.9117062007.

Adding to 123440312 its reverse (213044321), we get a palindrome (336484633).

The spelling of 123440312 in words is "one hundred twenty-three million, four hundred forty thousand, three hundred twelve".