12091530 has 48 divisors (see below), whose sum is σ = 31907232. Its totient is φ = 2930400.

The previous prime is 12091517. The next prime is 12091559. The reversal of 12091530 is 3519021.

It is a junction number, because it is equal to n+sod(n) for n = 12091497 and 12091506.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1965 + ... + 5295.

It is an arithmetic number, because the mean of its divisors is an integer number (664734).

Almost surely, 2^12091530 is an apocalyptic number.

12091530 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 12091530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15953616).

12091530 is an abundant number, since it is smaller than the sum of its proper divisors (19815702).

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

12091530 is a wasteful number, since it uses less digits than its factorization.

12091530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363 (or 3352 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 12091530 is about 3477.2877361530. The cubic root of 12091530 is about 229.5234619859.

It can be divided in two parts, 12091 and 530, that added together give a palindrome (12621).

The spelling of 12091530 in words is "twelve million, ninety-one thousand, five hundred thirty".