12291588 has 60 divisors (see below), whose sum is σ = 32728080. Its totient is φ = 4021488.

The previous prime is 12291577. The next prime is 12291589. The reversal of 12291588 is 88519221.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12291589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18795 + ... + 19437.

It is an arithmetic number, because the mean of its divisors is an integer number (545468).

Almost surely, 2^12291588 is an apocalyptic number.

12291588 is a gapful number since it is divisible by the number (18) 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 12291588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16364040).

12291588 is an abundant number, since it is smaller than the sum of its proper divisors (20436492).

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

12291588 is a wasteful number, since it uses less digits than its factorization.

12291588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 707 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 12291588 is about 3505.9361089444. The cubic root of 12291588 is about 230.7823890959.

It can be divided in two parts, 12 and 291588, that added together give a square (291600 = 540²).

The spelling of 12291588 in words is "twelve million, two hundred ninety-one thousand, five hundred eighty-eight".