8379991 has 4 divisors (see below), whose sum is σ = 8390952. Its totient is φ = 8369032.

The previous prime is 8379961. The next prime is 8380037. The reversal of 8379991 is 1999738.

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

It is a cyclic number.

It is not a de Polignac number, because 8379991 - 2⁷ = 8379863 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 (8379901) 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, 4240 + ... + 5893.

It is an arithmetic number, because the mean of its divisors is an integer number (2097738).

Almost surely, 2^8379991 is an apocalyptic number.

8379991 is a deficient number, since it is larger than the sum of its proper divisors (10961).

8379991 is a wasteful number, since it uses less digits than its factorization.

8379991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10960.

The product of its digits is 122472, while the sum is 46.

The square root of 8379991 is about 2894.8214107264. The cubic root of 8379991 is about 203.1177376812.

The spelling of 8379991 in words is "eight million, three hundred seventy-nine thousand, nine hundred ninety-one".