6405791 has 4 divisors (see below), whose sum is σ = 7320912. Its totient is φ = 5490672.

The previous prime is 6405767. The next prime is 6405797. The reversal of 6405791 is 1975046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1975046 = 2 ⋅987523.

It is a cyclic number.

It is not a de Polignac number, because 6405791 - 2⁶ = 6405727 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 (6405797) 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, 457550 + ... + 457563.

It is an arithmetic number, because the mean of its divisors is an integer number (1830228).

Almost surely, 2^6405791 is an apocalyptic number.

6405791 is a deficient number, since it is larger than the sum of its proper divisors (915121).

6405791 is an equidigital number, since it uses as much as digits as its factorization.

6405791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915120.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 6405791 is about 2530.9664162134. The cubic root of 6405791 is about 185.7195352982.

The spelling of 6405791 in words is "six million, four hundred five thousand, seven hundred ninety-one".