123313240 has 64 divisors (see below), whose sum is σ = 301008960. Its totient is φ = 45281280.

The previous prime is 123313237. The next prime is 123313259. The reversal of 123313240 is 42313321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25669 + ... + 30091.

It is an arithmetic number, because the mean of its divisors is an integer number (4703265).

Almost surely, 2^123313240 is an apocalyptic number.

123313240 is a gapful number since it is divisible by the number (10) 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 123313240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150504480).

123313240 is an abundant number, since it is smaller than the sum of its proper divisors (177695720).

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

123313240 is a wasteful number, since it uses less digits than its factorization.

123313240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4492 (or 4488 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 123313240 is about 11104.6494766832. The cubic root of 123313240 is about 497.7407940180.

Adding to 123313240 its reverse (42313321), we get a palindrome (165626561).

The spelling of 123313240 in words is "one hundred twenty-three million, three hundred thirteen thousand, two hundred forty".