12673991 has 4 divisors (see below), whose sum is σ = 13826184. Its totient is φ = 11521800.

The previous prime is 12673987. The next prime is 12674003. The reversal of 12673991 is 19937621.

It is a happy number.

12673991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19937621 = 11 ⋅1812511.

It is a cyclic number.

It is not a de Polignac number, because 12673991 - 2² = 12673987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12673901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576080 + ... + 576101.

It is an arithmetic number, because the mean of its divisors is an integer number (3456546).

Almost surely, 2^12673991 is an apocalyptic number.

12673991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12673991 is a deficient number, since it is larger than the sum of its proper divisors (1152193).

12673991 is a wasteful number, since it uses less digits than its factorization.

12673991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152192.

The product of its digits is 20412, while the sum is 38.

The square root of 12673991 is about 3560.0549153068. The cubic root of 12673991 is about 233.1512768096.

The spelling of 12673991 in words is "twelve million, six hundred seventy-three thousand, nine hundred ninety-one".