12720291 has 16 divisors (see below), whose sum is σ = 18291840. Its totient is φ = 7836480.

The previous prime is 12720283. The next prime is 12720317. The reversal of 12720291 is 19202721.

It is not a de Polignac number, because 12720291 - 2³ = 12720283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12720271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385 + ... + 5058.

It is an arithmetic number, because the mean of its divisors is an integer number (1143240).

Almost surely, 2^12720291 is an apocalyptic number.

12720291 is a deficient number, since it is larger than the sum of its proper divisors (5571549).

12720291 is a wasteful number, since it uses less digits than its factorization.

12720291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 12720291 is about 3566.5516959663. The cubic root of 12720291 is about 233.4348440404.

The spelling of 12720291 in words is "twelve million, seven hundred twenty thousand, two hundred ninety-one".