12643791 has 8 divisors (see below), whose sum is σ = 16874880. Its totient is φ = 8420952.

The previous prime is 12643783. The next prime is 12643793. The reversal of 12643791 is 19734621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12643791 - 2³ = 12643783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4516 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (2109360).

Almost surely, 2^12643791 is an apocalyptic number.

12643791 is a deficient number, since it is larger than the sum of its proper divisors (4231089).

12643791 is a wasteful number, since it uses less digits than its factorization.

12643791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4125.

The product of its digits is 9072, while the sum is 33.

The square root of 12643791 is about 3555.8108779855. The cubic root of 12643791 is about 232.9659426972.

The spelling of 12643791 in words is "twelve million, six hundred forty-three thousand, seven hundred ninety-one".