8439979 has 4 divisors (see below), whose sum is σ = 8517520. Its totient is φ = 8362440.

The previous prime is 8439961. The next prime is 8439989. The reversal of 8439979 is 9799348.

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 8439979 - 2⁵ = 8439947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8439989) 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, 38607 + ... + 38824.

It is an arithmetic number, because the mean of its divisors is an integer number (2129380).

Almost surely, 2^8439979 is an apocalyptic number.

8439979 is a deficient number, since it is larger than the sum of its proper divisors (77541).

8439979 is a wasteful number, since it uses less digits than its factorization.

8439979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77540.

The product of its digits is 489888, while the sum is 49.

The square root of 8439979 is about 2905.1641950155. The cubic root of 8439979 is about 203.6012571924.

The spelling of 8439979 in words is "eight million, four hundred thirty-nine thousand, nine hundred seventy-nine".