12720881 has 8 divisors (see below), whose sum is σ = 13204224. Its totient is φ = 12242160.

The previous prime is 12720847. The next prime is 12720887. The reversal of 12720881 is 18802721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12720881 - 2¹⁰ = 12719857 is a prime.

It is a super-2 number, since 2×12720881² = 323641626832322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12720887) 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 7 ways as a sum of consecutive naturals, for example, 5066 + ... + 7148.

It is an arithmetic number, because the mean of its divisors is an integer number (1650528).

Almost surely, 2^12720881 is an apocalyptic number.

It is an amenable number.

12720881 is a deficient number, since it is larger than the sum of its proper divisors (483343).

12720881 is a wasteful number, since it uses less digits than its factorization.

12720881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 12720881 is about 3566.6344079538. The cubic root of 12720881 is about 233.4384530886.

The spelling of 12720881 in words is "twelve million, seven hundred twenty thousand, eight hundred eighty-one".