12172530 has 64 divisors (see below), whose sum is σ = 30481920. Its totient is φ = 3108864.

The previous prime is 12172513. The next prime is 12172549. The reversal of 12172530 is 3527121.

It is a junction number, because it is equal to n+sod(n) for n = 12172497 and 12172506.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125442 + ... + 125538.

It is an arithmetic number, because the mean of its divisors is an integer number (476280).

Almost surely, 2^12172530 is an apocalyptic number.

12172530 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 12172530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15240960).

12172530 is an abundant number, since it is smaller than the sum of its proper divisors (18309390).

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

12172530 is a wasteful number, since it uses less digits than its factorization.

12172530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 12172530 is about 3488.9153042171. The cubic root of 12172530 is about 230.0348403428.

Adding to 12172530 its reverse (3527121), we get a palindrome (15699651).

The spelling of 12172530 in words is "twelve million, one hundred seventy-two thousand, five hundred thirty".