12721580 has 24 divisors (see below), whose sum is σ = 27170640. Its totient is φ = 5001920.

The previous prime is 12721549. The next prime is 12721601. The reversal of 12721580 is 8512721.

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 7 ways as a sum of consecutive naturals, for example, 4211 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (1132110).

Almost surely, 2^12721580 is an apocalyptic number.

12721580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12721580 is an abundant number, since it is smaller than the sum of its proper divisors (14449060).

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

12721580 is a wasteful number, since it uses less digits than its factorization.

12721580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10849 (or 10847 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12721580 is about 3566.7323981482. The cubic root of 12721580 is about 233.4427287487.

The spelling of 12721580 in words is "twelve million, seven hundred twenty-one thousand, five hundred eighty".