123731312 has 20 divisors (see below), whose sum is σ = 243309576. Its totient is φ = 60941760.

The previous prime is 123731299. The next prime is 123731347. The reversal of 123731312 is 213137321.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56639 + ... + 58782.

Almost surely, 2^123731312 is an apocalyptic number.

It is an amenable number.

123731312 is a deficient number, since it is larger than the sum of its proper divisors (119578264).

123731312 is a wasteful number, since it uses less digits than its factorization.

123731312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115496 (or 115490 counting only the distinct ones).

The product of its digits is 756, while the sum is 23.

The square root of 123731312 is about 11123.4577357942. The cubic root of 123731312 is about 498.3026605979.

Adding to 123731312 its reverse (213137321), we get a palindrome (336868633).

The spelling of 123731312 in words is "one hundred twenty-three million, seven hundred thirty-one thousand, three hundred twelve".