12909056 has 40 divisors (see below), whose sum is σ = 27170880. Its totient is φ = 6110208.

The previous prime is 12909047. The next prime is 12909077. The reversal of 12909056 is 65090921.

It is a super-2 number, since 2×12909056² = 333287453622272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9065 + ... + 10391.

It is an arithmetic number, because the mean of its divisors is an integer number (679272).

Almost surely, 2^12909056 is an apocalyptic number.

12909056 is a gapful number since it is divisible by the number (16) 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 12909056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13585440).

12909056 is an abundant number, since it is smaller than the sum of its proper divisors (14261824).

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

12909056 is an equidigital number, since it uses as much as digits as its factorization.

12909056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 12909056 is about 3592.9174774826. The cubic root of 12909056 is about 234.5838780506.

Adding to 12909056 its reverse (65090921), we get a palindrome (77999977).

The spelling of 12909056 in words is "twelve million, nine hundred nine thousand, fifty-six".