6391945 has 8 divisors (see below), whose sum is σ = 8766144. Its totient is φ = 4383024.

The previous prime is 6391939. The next prime is 6391963. The reversal of 6391945 is 5491936.

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

It is a cyclic number.

It is not a de Polignac number, because 6391945 - 2⁷ = 6391817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91279 + ... + 91348.

It is an arithmetic number, because the mean of its divisors is an integer number (1095768).

Almost surely, 2^6391945 is an apocalyptic number.

It is an amenable number.

6391945 is a deficient number, since it is larger than the sum of its proper divisors (2374199).

6391945 is a wasteful number, since it uses less digits than its factorization.

6391945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182639.

The product of its digits is 29160, while the sum is 37.

The square root of 6391945 is about 2528.2296177365. The cubic root of 6391945 is about 185.5856289810.

Subtracting from 6391945 its reverse (5491936), we obtain a palindrome (900009).

The spelling of 6391945 in words is "six million, three hundred ninety-one thousand, nine hundred forty-five".