7979889 has 4 divisors (see below), whose sum is σ = 10639856. Its totient is φ = 5319924.

The previous prime is 7979863. The next prime is 7979891. The reversal of 7979889 is 9889797.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9889797 = 3 ⋅3296599.

It is not a de Polignac number, because 7979889 - 2⁵ = 7979857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7979819) 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 3 ways as a sum of consecutive naturals, for example, 1329979 + ... + 1329984.

It is an arithmetic number, because the mean of its divisors is an integer number (2659964).

Almost surely, 2^7979889 is an apocalyptic number.

It is an amenable number.

7979889 is a deficient number, since it is larger than the sum of its proper divisors (2659967).

7979889 is a wasteful number, since it uses less digits than its factorization.

7979889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659966.

The product of its digits is 2286144, while the sum is 57.

The square root of 7979889 is about 2824.8697315098. The cubic root of 7979889 is about 199.8322677020.

The spelling of 7979889 in words is "seven million, nine hundred seventy-nine thousand, eight hundred eighty-nine".