12271500 has 144 divisors (see below), whose sum is σ = 40543776. Its totient is φ = 3240000.

The previous prime is 12271499. The next prime is 12271507. The reversal of 12271500 is 517221.

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

It is not an unprimeable number, because it can be changed into a prime (12271507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121450 + ... + 121550.

It is an arithmetic number, because the mean of its divisors is an integer number (281554).

Almost surely, 2^12271500 is an apocalyptic number.

12271500 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 12271500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20271888).

12271500 is an abundant number, since it is smaller than the sum of its proper divisors (28272276).

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

12271500 is a wasteful number, since it uses less digits than its factorization.

12271500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 12271500 is about 3503.0700820851. The cubic root of 12271500 is about 230.6565988827.

Adding to 12271500 its reverse (517221), we get a palindrome (12788721).

The spelling of 12271500 in words is "twelve million, two hundred seventy-one thousand, five hundred".