123396681720 has 192 divisors, whose sum is σ = 413789644800. Its totient is φ = 29394593280.

The previous prime is 123396681673. The next prime is 123396681731. The reversal of 123396681720 is 27186693321.

It is a self number, because there is not a number n which added to its sum of digits gives 123396681720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 530541 + ... + 726819.

It is an arithmetic number, because the mean of its divisors is an integer number (2155154400).

Almost surely, 2^123396681720 is an apocalyptic number.

123396681720 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 123396681720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206894822400).

123396681720 is an abundant number, since it is smaller than the sum of its proper divisors (290392963080).

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

123396681720 is a wasteful number, since it uses less digits than its factorization.

123396681720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196350 (or 196333 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 123396681720 in words is "one hundred twenty-three billion, three hundred ninety-six million, six hundred eighty-one thousand, seven hundred twenty".