123130440 has 96 divisors (see below), whose sum is σ = 401544000. Its totient is φ = 32722560.

The previous prime is 123130379. The next prime is 123130451. The reversal of 123130440 is 44031321.

It is a super-2 number, since 2×123130440² = 30322210509187200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 205261 + ... + 205859.

It is an arithmetic number, because the mean of its divisors is an integer number (4182750).

Almost surely, 2^123130440 is an apocalyptic number.

123130440 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 123130440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200772000).

123130440 is an abundant number, since it is smaller than the sum of its proper divisors (278413560).

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

123130440 is a wasteful number, since it uses less digits than its factorization.

123130440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187 (or 1180 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 123130440 is about 11096.4156374930. The cubic root of 123130440 is about 497.4947214578.

Adding to 123130440 its reverse (44031321), we get a palindrome (167161761).

The spelling of 123130440 in words is "one hundred twenty-three million, one hundred thirty thousand, four hundred forty".