7984789 has 2 divisors, whose sum is σ = 7984790. Its totient is φ = 7984788.

The previous prime is 7984787. The next prime is 7984793. The reversal of 7984789 is 9874897.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7606564 + 378225 = 2758^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 7984789 - 2¹ = 7984787 is a prime.

Together with 7984787, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7984787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3992394 + 3992395.

It is an arithmetic number, because the mean of its divisors is an integer number (3992395).

Almost surely, 2^7984789 is an apocalyptic number.

It is an amenable number.

7984789 is a deficient number, since it is larger than the sum of its proper divisors (1).

7984789 is an equidigital number, since it uses as much as digits as its factorization.

7984789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 52.

The square root of 7984789 is about 2825.7368950417. The cubic root of 7984789 is about 199.8731612433.

The spelling of 7984789 in words is "seven million, nine hundred eighty-four thousand, seven hundred eighty-nine".