123445140 has 192 divisors, whose sum is σ = 444358656. Its totient is φ = 24887808.

The previous prime is 123445123. The next prime is 123445181. The reversal of 123445140 is 41544321.

It is a self number, because there is not a number n which added to its sum of digits gives 123445140.

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 63 ways as a sum of consecutive naturals, for example, 125089 + ... + 126071.

It is an arithmetic number, because the mean of its divisors is an integer number (2314368).

Almost surely, 2^123445140 is an apocalyptic number.

123445140 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 123445140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222179328).

123445140 is an abundant number, since it is smaller than the sum of its proper divisors (320913516).

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

123445140 is a wasteful number, since it uses less digits than its factorization.

123445140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 123445140 is about 11110.5868431870. The cubic root of 123445140 is about 497.9181975603.

Adding to 123445140 its reverse (41544321), we get a palindrome (164989461).

The spelling of 123445140 in words is "one hundred twenty-three million, four hundred forty-five thousand, one hundred forty".