123412012540 has 24 divisors (see below), whose sum is σ = 259993243440. Its totient is φ = 49207087488.

The previous prime is 123412012519. The next prime is 123412012541. The reversal of 123412012540 is 45210214321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123412012541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9850930 + ... + 9863449.

It is an arithmetic number, because the mean of its divisors is an integer number (10833051810).

Almost surely, 2^123412012540 is an apocalyptic number.

123412012540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123412012540 is an abundant number, since it is smaller than the sum of its proper divisors (136581230900).

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

123412012540 is a wasteful number, since it uses less digits than its factorization.

123412012540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19714701 (or 19714699 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 123412012540 its reverse (45210214321), we get a palindrome (168622226861).

The spelling of 123412012540 in words is "one hundred twenty-three billion, four hundred twelve million, twelve thousand, five hundred forty".