6379991 has 8 divisors (see below), whose sum is σ = 6740400. Its totient is φ = 6022080.

The previous prime is 6379963. The next prime is 6379999. The reversal of 6379991 is 1999736.

It is a happy number.

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 6379991 - 2⁶ = 6379927 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 (6379999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7361 + ... + 8181.

It is an arithmetic number, because the mean of its divisors is an integer number (842550).

Almost surely, 2^6379991 is an apocalyptic number.

6379991 is a deficient number, since it is larger than the sum of its proper divisors (360409).

6379991 is a wasteful number, since it uses less digits than its factorization.

6379991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249.

The product of its digits is 91854, while the sum is 44.

The square root of 6379991 is about 2525.8644064953. The cubic root of 6379991 is about 185.4698647898.

The spelling of 6379991 in words is "six million, three hundred seventy-nine thousand, nine hundred ninety-one".