7983989 has 4 divisors (see below), whose sum is σ = 8598156. Its totient is φ = 7369824.

The previous prime is 7983979. The next prime is 7984001. The reversal of 7983989 is 9893897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9893897 = 13 ⋅761069.

It can be written as a sum of positive squares in 2 ways, for example, as 1067089 + 6916900 = 1033^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 7983989 - 2⁸ = 7983733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7983989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7983919) 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, 307064 + ... + 307089.

It is an arithmetic number, because the mean of its divisors is an integer number (2149539).

Almost surely, 2^7983989 is an apocalyptic number.

It is an amenable number.

7983989 is a deficient number, since it is larger than the sum of its proper divisors (614167).

7983989 is a wasteful number, since it uses less digits than its factorization.

7983989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614166.

The product of its digits is 979776, while the sum is 53.

The square root of 7983989 is about 2825.5953355001. The cubic root of 7983989 is about 199.8664858897.

The spelling of 7983989 in words is "seven million, nine hundred eighty-three thousand, nine hundred eighty-nine".