123401324240 has 40 divisors (see below), whose sum is σ = 287966830848. Its totient is φ = 49178378880.

The previous prime is 123401324231. The next prime is 123401324273. The reversal of 123401324240 is 42423104321.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×123401324240² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2824292 + ... + 2867651.

Almost surely, 2^123401324240 is an apocalyptic number.

123401324240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123401324240 is an abundant number, since it is smaller than the sum of its proper divisors (164565506608).

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

123401324240 is a wasteful number, since it uses less digits than its factorization.

123401324240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692227 (or 5692221 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 123401324240 its reverse (42423104321), we get a palindrome (165824428561).

The spelling of 123401324240 in words is "one hundred twenty-three billion, four hundred one million, three hundred twenty-four thousand, two hundred forty".