123756212340 has 192 divisors, whose sum is σ = 410837817600. Its totient is φ = 30836256768.

The previous prime is 123756212317. The next prime is 123756212369. The reversal of 123756212340 is 43212657321.

123756212340 is a `hidden beast` number, since 1 + 2 + 3 + 7 + 5 + 621 + 23 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123756212295 and 123756212304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 666364 + ... + 831596.

It is an arithmetic number, because the mean of its divisors is an integer number (2139780300).

Almost surely, 2^123756212340 is an apocalyptic number.

123756212340 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 123756212340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205418908800).

123756212340 is an abundant number, since it is smaller than the sum of its proper divisors (287081605260).

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

123756212340 is a wasteful number, since it uses less digits than its factorization.

123756212340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165343 (or 165335 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

Adding to 123756212340 its reverse (43212657321), we get a palindrome (166968869661).

The spelling of 123756212340 in words is "one hundred twenty-three billion, seven hundred fifty-six million, two hundred twelve thousand, three hundred forty".