123240312 has 64 divisors (see below), whose sum is σ = 368676000. Its totient is φ = 37919232.

The previous prime is 123240263. The next prime is 123240323. The reversal of 123240312 is 213042321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19137 + ... + 24752.

Almost surely, 2^123240312 is an apocalyptic number.

123240312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123240312 is an abundant number, since it is smaller than the sum of its proper divisors (245435688).

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

123240312 is a wasteful number, since it uses less digits than its factorization.

123240312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43917 (or 43907 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 123240312 is about 11101.3653214368. The cubic root of 123240312 is about 497.6426526267.

Adding to 123240312 its reverse (213042321), we get a palindrome (336282633).

The spelling of 123240312 in words is "one hundred twenty-three million, two hundred forty thousand, three hundred twelve".