123523530 has 128 divisors (see below), whose sum is σ = 349526016. Its totient is φ = 27648000.

The previous prime is 123523523. The next prime is 123523537. The reversal of 123523530 is 35325321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123523523) and next prime (123523537).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 123523530.

It is not an unprimeable number, because it can be changed into a prime (123523537) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 205230 + ... + 205830.

It is an arithmetic number, because the mean of its divisors is an integer number (2730672).

Almost surely, 2^123523530 is an apocalyptic number.

123523530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123523530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174763008).

123523530 is an abundant number, since it is smaller than the sum of its proper divisors (226002486).

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

123523530 is a wasteful number, since it uses less digits than its factorization.

123523530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 123523530 is about 11114.1139997752. The cubic root of 123523530 is about 498.0235710848.

Adding to 123523530 its reverse (35325321), we get a palindrome (158848851).

The spelling of 123523530 in words is "one hundred twenty-three million, five hundred twenty-three thousand, five hundred thirty".