12219660 has 120 divisors (see below), whose sum is σ = 40452720. Its totient is φ = 3079296.

The previous prime is 12219659. The next prime is 12219677. The reversal of 12219660 is 6691221.

12219660 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 30582 + ... + 30978.

It is an arithmetic number, because the mean of its divisors is an integer number (337106).

Almost surely, 2^12219660 is an apocalyptic number.

12219660 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 12219660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20226360).

12219660 is an abundant number, since it is smaller than the sum of its proper divisors (28233060).

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

12219660 is a wasteful number, since it uses less digits than its factorization.

12219660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 12219660 is about 3495.6630272382. The cubic root of 12219660 is about 230.3313434755.

The spelling of 12219660 in words is "twelve million, two hundred nineteen thousand, six hundred sixty".