12215250 has 96 divisors (see below), whose sum is σ = 33948720. Its totient is φ = 3168000.

The previous prime is 12215237. The next prime is 12215257. The reversal of 12215250 is 5251221.

It can be written as a sum of positive squares in 8 ways, for example, as 986049 + 11229201 = 993^2 + 3351^2 .

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 (12215257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137206 + ... + 137294.

Almost surely, 2^12215250 is an apocalyptic number.

12215250 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 12215250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16974360).

12215250 is an abundant number, since it is smaller than the sum of its proper divisors (21733470).

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

12215250 is a wasteful number, since it uses less digits than its factorization.

12215250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 12215250 is about 3495.0321886930. The cubic root of 12215250 is about 230.3036317540.

Adding to 12215250 its reverse (5251221), we get a palindrome (17466471).

The spelling of 12215250 in words is "twelve million, two hundred fifteen thousand, two hundred fifty".