123409835520 has 160 divisors (see below), whose sum is σ = 405189610848. Its totient is φ = 32019775488.

The previous prime is 123409835491. The next prime is 123409835531. The reversal of 123409835520 is 25538904321.

It is a tau number, because it is divible by the number of its divisors (160).

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, 67012 + ... + 501308.

Almost surely, 2^123409835520 is an apocalyptic number.

123409835520 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 123409835520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202594805424).

123409835520 is an abundant number, since it is smaller than the sum of its proper divisors (281779775328).

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

123409835520 is an equidigital number, since it uses as much as digits as its factorization.

123409835520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434360 (or 434344 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 123409835520 in words is "one hundred twenty-three billion, four hundred nine million, eight hundred thirty-five thousand, five hundred twenty".