12215610 has 96 divisors (see below), whose sum is σ = 36009792. Its totient is φ = 2954880.

The previous prime is 12215591. The next prime is 12215611. The reversal of 12215610 is 1651221.

It is a super-2 number, since 2×12215610² = 298442255344200, which contains 22 as substring.

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 (12215611) 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, 26502 + ... + 26958.

It is an arithmetic number, because the mean of its divisors is an integer number (375102).

Almost surely, 2^12215610 is an apocalyptic number.

12215610 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 12215610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18004896).

12215610 is an abundant number, since it is smaller than the sum of its proper divisors (23794182).

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

12215610 is a wasteful number, since it uses less digits than its factorization.

12215610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12215610 is about 3495.0836899851. The cubic root of 12215610 is about 230.3058941853.

Adding to 12215610 its reverse (1651221), we get a palindrome (13866831).

The spelling of 12215610 in words is "twelve million, two hundred fifteen thousand, six hundred ten".