12889220 has 48 divisors (see below), whose sum is σ = 28848960. Its totient is φ = 4823424.

The previous prime is 12889187. The next prime is 12889231. The reversal of 12889220 is 2298821.

It is a super-2 number, since 2×12889220² = 332263984416800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40502 + ... + 40818.

It is an arithmetic number, because the mean of its divisors is an integer number (601020).

Almost surely, 2^12889220 is an apocalyptic number.

12889220 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 12889220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14424480).

12889220 is an abundant number, since it is smaller than the sum of its proper divisors (15959740).

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

12889220 is a wasteful number, since it uses less digits than its factorization.

12889220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 12889220 is about 3590.1559854692. The cubic root of 12889220 is about 234.4636629291.

The spelling of 12889220 in words is "twelve million, eight hundred eighty-nine thousand, two hundred twenty".