12720081 has 16 divisors (see below), whose sum is σ = 19307520. Its totient is φ = 7373520.

The previous prime is 12720077. The next prime is 12720083. The reversal of 12720081 is 18002721.

It is not a de Polignac number, because 12720081 - 2² = 12720077 is a prime.

It is a super-2 number, since 2×12720081² = 323600921293122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12720083) 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 15 ways as a sum of consecutive naturals, for example, 7621 + ... + 9138.

It is an arithmetic number, because the mean of its divisors is an integer number (1206720).

Almost surely, 2^12720081 is an apocalyptic number.

12720081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12720081 is a deficient number, since it is larger than the sum of its proper divisors (6587439).

12720081 is a wasteful number, since it uses less digits than its factorization.

12720081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16796.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 12720081 is about 3566.5222556434. The cubic root of 12720081 is about 233.4335594370.

The spelling of 12720081 in words is "twelve million, seven hundred twenty thousand, eighty-one".