123679012140 has 144 divisors (see below), whose sum is σ = 380373084000. Its totient is φ = 32524207104.

The previous prime is 123679012099. The next prime is 123679012159. The reversal of 123679012140 is 41210976321.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123679012095 and 123679012104.

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, 8493586 + ... + 8508134.

It is an arithmetic number, because the mean of its divisors is an integer number (2641479750).

Almost surely, 2^123679012140 is an apocalyptic number.

123679012140 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 123679012140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190186542000).

123679012140 is an abundant number, since it is smaller than the sum of its proper divisors (256694071860).

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

123679012140 is a wasteful number, since it uses less digits than its factorization.

123679012140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15216 (or 15211 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

Adding to 123679012140 its reverse (41210976321), we get a palindrome (164889988461).

The spelling of 123679012140 in words is "one hundred twenty-three billion, six hundred seventy-nine million, twelve thousand, one hundred forty".