6391479 has 4 divisors (see below), whose sum is σ = 8521976. Its totient is φ = 4260984.

The previous prime is 6391471. The next prime is 6391499. The reversal of 6391479 is 9741936.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6391479 - 2³ = 6391471 is a prime.

It is a D-number.

It is a Duffinian number.

6391479 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6391471) 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, 1065244 + ... + 1065249.

It is an arithmetic number, because the mean of its divisors is an integer number (2130494).

Almost surely, 2^6391479 is an apocalyptic number.

6391479 is a deficient number, since it is larger than the sum of its proper divisors (2130497).

6391479 is a wasteful number, since it uses less digits than its factorization.

6391479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130496.

The product of its digits is 40824, while the sum is 39.

The square root of 6391479 is about 2528.1374567060. The cubic root of 6391479 is about 185.5811188773.

The spelling of 6391479 in words is "six million, three hundred ninety-one thousand, four hundred seventy-nine".