6391477 has 4 divisors (see below), whose sum is σ = 6540160. Its totient is φ = 6242796.

The previous prime is 6391471. The next prime is 6391499. The reversal of 6391477 is 7741936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6391477 is a prime.

It is a Duffinian number.

6391477 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74277 + ... + 74362.

It is an arithmetic number, because the mean of its divisors is an integer number (1635040).

Almost surely, 2^6391477 is an apocalyptic number.

It is an amenable number.

6391477 is a deficient number, since it is larger than the sum of its proper divisors (148683).

6391477 is a wasteful number, since it uses less digits than its factorization.

6391477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148682.

The product of its digits is 31752, while the sum is 37.

The square root of 6391477 is about 2528.1370611579. The cubic root of 6391477 is about 185.5810995202.

It can be divided in two parts, 639 and 1477, that added together give a square (2116 = 46²).

The spelling of 6391477 in words is "six million, three hundred ninety-one thousand, four hundred seventy-seven".