12721456 has 30 divisors (see below), whose sum is σ = 27096356. Its totient is φ = 5781600.

The previous prime is 12721447. The next prime is 12721477. The reversal of 12721456 is 65412721.

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 5 ways as a sum of consecutive naturals, for example, 1350 + ... + 5221.

Almost surely, 2^12721456 is an apocalyptic number.

12721456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12721456 is an abundant number, since it is smaller than the sum of its proper divisors (14374900).

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

12721456 is a wasteful number, since it uses less digits than its factorization.

12721456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601 (or 6584 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 12721456 is about 3566.7150152486. The cubic root of 12721456 is about 233.4419702739.

The spelling of 12721456 in words is "twelve million, seven hundred twenty-one thousand, four hundred fifty-six".