12921280 has 56 divisors (see below), whose sum is σ = 31089600. Its totient is φ = 5114880.

The previous prime is 12921277. The next prime is 12921281. The reversal of 12921280 is 8212921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47545 + ... + 47815.

Almost surely, 2^12921280 is an apocalyptic number.

12921280 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 12921280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15544800).

12921280 is an abundant number, since it is smaller than the sum of its proper divisors (18168320).

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

12921280 is a wasteful number, since it uses less digits than its factorization.

12921280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12921280 is about 3594.6181994754. The cubic root of 12921280 is about 234.6578996954.

The spelling of 12921280 in words is "twelve million, nine hundred twenty-one thousand, two hundred eighty".