12957220 has 12 divisors (see below), whose sum is σ = 27210204. Its totient is φ = 5182880.

The previous prime is 12957209. The next prime is 12957223. The reversal of 12957220 is 2275921.

It can be written as a sum of positive squares in 2 ways, for example, as 3873024 + 9084196 = 1968^2 + 3014^2 .

It is not an unprimeable number, because it can be changed into a prime (12957223) by changing a digit.

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, 323911 + ... + 323950.

It is an arithmetic number, because the mean of its divisors is an integer number (2267517).

Almost surely, 2^12957220 is an apocalyptic number.

12957220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12957220 is an abundant number, since it is smaller than the sum of its proper divisors (14252984).

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

12957220 is a wasteful number, since it uses less digits than its factorization.

12957220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647870 (or 647868 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 12957220 is about 3599.6138681809. The cubic root of 12957220 is about 234.8752620036.

It can be divided in two parts, 1295 and 7220, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 12957220 in words is "twelve million, nine hundred fifty-seven thousand, two hundred twenty".