12220890 has 64 divisors (see below), whose sum is σ = 33125760. Its totient is φ = 2858240.

The previous prime is 12220877. The next prime is 12220891. The reversal of 12220890 is 9802221.

It is a self number, because there is not a number n which added to its sum of digits gives 12220890.

It is not an unprimeable number, because it can be changed into a prime (12220891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8932 + ... + 10208.

It is an arithmetic number, because the mean of its divisors is an integer number (517590).

Almost surely, 2^12220890 is an apocalyptic number.

12220890 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 12220890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16562880).

12220890 is an abundant number, since it is smaller than the sum of its proper divisors (20904870).

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

12220890 is a wasteful number, since it uses less digits than its factorization.

12220890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 12220890 is about 3495.8389551008. The cubic root of 12220890 is about 230.3390714059.

It can be divided in two parts, 122 and 20890, that added together give a palindrome (21012).

The spelling of 12220890 in words is "twelve million, two hundred twenty thousand, eight hundred ninety".