123440140 has 48 divisors (see below), whose sum is σ = 274869504. Its totient is φ = 46483200.

The previous prime is 123440137. The next prime is 123440167. The reversal of 123440140 is 41044321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20250 + ... + 25630.

It is an arithmetic number, because the mean of its divisors is an integer number (5726448).

Almost surely, 2^123440140 is an apocalyptic number.

123440140 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 123440140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137434752).

123440140 is an abundant number, since it is smaller than the sum of its proper divisors (151429364).

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

123440140 is a wasteful number, since it uses less digits than its factorization.

123440140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5458 (or 5456 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 123440140 is about 11110.3618302916. The cubic root of 123440140 is about 497.9114749395.

Adding to 123440140 its reverse (41044321), we get a palindrome (164484461).

The spelling of 123440140 in words is "one hundred twenty-three million, four hundred forty thousand, one hundred forty".