12791678 has 4 divisors (see below), whose sum is σ = 19187520. Its totient is φ = 6395838.

The previous prime is 12791671. The next prime is 12791687. The reversal of 12791678 is 87619721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87619721 = 7 ⋅12517103.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12791671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3197918 + ... + 3197921.

It is an arithmetic number, because the mean of its divisors is an integer number (4796880).

Almost surely, 2^12791678 is an apocalyptic number.

12791678 is a deficient number, since it is larger than the sum of its proper divisors (6395842).

12791678 is an equidigital number, since it uses as much as digits as its factorization.

12791678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6395841.

The product of its digits is 42336, while the sum is 41.

The square root of 12791678 is about 3576.5455400428. The cubic root of 12791678 is about 233.8707129089.

The spelling of 12791678 in words is "twelve million, seven hundred ninety-one thousand, six hundred seventy-eight".