12961220 has 12 divisors (see below), whose sum is σ = 27218604. Its totient is φ = 5184480.

The previous prime is 12961187. The next prime is 12961243. The reversal of 12961220 is 2216921.

It can be written as a sum of positive squares in 2 ways, for example, as 10291264 + 2669956 = 3208^2 + 1634^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324011 + ... + 324050.

It is an arithmetic number, because the mean of its divisors is an integer number (2268217).

Almost surely, 2^12961220 is an apocalyptic number.

12961220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12961220 is an abundant number, since it is smaller than the sum of its proper divisors (14257384).

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

12961220 is a wasteful number, since it uses less digits than its factorization.

12961220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648070 (or 648068 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 12961220 is about 3600.1694404569. The cubic root of 12961220 is about 234.8994288230.

The spelling of 12961220 in words is "twelve million, nine hundred sixty-one thousand, two hundred twenty".