123530040 has 96 divisors (see below), whose sum is σ = 414460800. Its totient is φ = 31875840.

The previous prime is 123530003. The next prime is 123530047. The reversal of 123530040 is 40035321.

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

It is a junction number, because it is equal to n+sod(n) for n = 123529995 and 123530022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123530047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5626 + ... + 16694.

It is an arithmetic number, because the mean of its divisors is an integer number (4317300).

Almost surely, 2^123530040 is an apocalyptic number.

123530040 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 123530040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207230400).

123530040 is an abundant number, since it is smaller than the sum of its proper divisors (290930760).

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

123530040 is a wasteful number, since it uses less digits than its factorization.

123530040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11117 (or 11110 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 123530040 is about 11114.4068667653. The cubic root of 123530040 is about 498.0323199617.

Adding to 123530040 its reverse (40035321), we get a palindrome (163565361).

The spelling of 123530040 in words is "one hundred twenty-three million, five hundred thirty thousand, forty".