12991272 has 48 divisors (see below), whose sum is σ = 37784160. Its totient is φ = 3711456.

The previous prime is 12991267. The next prime is 12991291. The reversal of 12991272 is 27219921.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4348 + ... + 6699.

It is an arithmetic number, because the mean of its divisors is an integer number (787170).

Almost surely, 2^12991272 is an apocalyptic number.

12991272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12991272 is an abundant number, since it is smaller than the sum of its proper divisors (24792888).

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

12991272 is a wasteful number, since it uses less digits than its factorization.

12991272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11070 (or 11059 counting only the distinct ones).

The product of its digits is 4536, while the sum is 33.

The square root of 12991272 is about 3604.3407164140. The cubic root of 12991272 is about 235.0808353267.

The spelling of 12991272 in words is "twelve million, nine hundred ninety-one thousand, two hundred seventy-two".