12720281 has 8 divisors (see below), whose sum is σ = 14562240. Its totient is φ = 10884528.

The previous prime is 12720271. The next prime is 12720283. The reversal of 12720281 is 18202721.

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 12720281 - 2²² = 8525977 is a prime.

It is a super-2 number, since 2×12720281² = 323611097437922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12720283) 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, 4355 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (1820280).

Almost surely, 2^12720281 is an apocalyptic number.

It is an amenable number.

12720281 is a deficient number, since it is larger than the sum of its proper divisors (1841959).

12720281 is an equidigital number, since it uses as much as digits as its factorization.

12720281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3103.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12720281 is about 3566.5502940517. The cubic root of 12720281 is about 233.4347828691.

The spelling of 12720281 in words is "twelve million, seven hundred twenty thousand, two hundred eighty-one".