12215700 has 162 divisors, whose sum is σ = 44701566. Its totient is φ = 2782080.

The previous prime is 12215683. The next prime is 12215701. The reversal of 12215700 is 751221.

12215700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 63504 + 12152196 = 252^2 + 3486^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215701) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 43962 + ... + 44238.

Almost surely, 2^12215700 is an apocalyptic number.

12215700 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 12215700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22350783).

12215700 is an abundant number, since it is smaller than the sum of its proper divisors (32485866).

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

12215700 is a wasteful number, since it uses less digits than its factorization.

12215700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 294 counting only the distinct ones).

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

The square root of 12215700 is about 3495.0965651896. The cubic root of 12215700 is about 230.3064597862.

Adding to 12215700 its reverse (751221), we get a palindrome (12966921).

The spelling of 12215700 in words is "twelve million, two hundred fifteen thousand, seven hundred".