123289235540 has 24 divisors (see below), whose sum is σ = 263295658080. Its totient is φ = 48479834528.

The previous prime is 123289235539. The next prime is 123289235557. The reversal of 123289235540 is 45532982321.

It is a junction number, because it is equal to n+sod(n) for n = 123289235491 and 123289235500.

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 7 ways as a sum of consecutive naturals, for example, 52240022 + ... + 52242381.

It is an arithmetic number, because the mean of its divisors is an integer number (10970652420).

Almost surely, 2^123289235540 is an apocalyptic number.

123289235540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123289235540 is an abundant number, since it is smaller than the sum of its proper divisors (140006422540).

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

123289235540 is a wasteful number, since it uses less digits than its factorization.

123289235540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104482471 (or 104482469 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 123289235540 in words is "one hundred twenty-three billion, two hundred eighty-nine million, two hundred thirty-five thousand, five hundred forty".