12991347 has 10 divisors (see below), whose sum is σ = 19406948. Its totient is φ = 8660844.

The previous prime is 12991339. The next prime is 12991351. The reversal of 12991347 is 74319921.

It is not a de Polignac number, because 12991347 - 2³ = 12991339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12991397) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 80113 + ... + 80274.

Almost surely, 2^12991347 is an apocalyptic number.

12991347 is a deficient number, since it is larger than the sum of its proper divisors (6415601).

12991347 is an equidigital number, since it uses as much as digits as its factorization.

12991347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160399 (or 160390 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 12991347 is about 3604.3511205209. The cubic root of 12991347 is about 235.0812877081.

The spelling of 12991347 in words is "twelve million, nine hundred ninety-one thousand, three hundred forty-seven".