7989409 has 2 divisors, whose sum is σ = 7989410. Its totient is φ = 7989408.

The previous prime is 7989407. The next prime is 7989419. The reversal of 7989409 is 9049897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4100625 + 3888784 = 2025^2 + 1972^2 .

It is a cyclic number.

It is not a de Polignac number, because 7989409 - 2¹ = 7989407 is a prime.

Together with 7989407, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7989407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3994704 + 3994705.

It is an arithmetic number, because the mean of its divisors is an integer number (3994705).

Almost surely, 2^7989409 is an apocalyptic number.

It is an amenable number.

7989409 is a deficient number, since it is larger than the sum of its proper divisors (1).

7989409 is an equidigital number, since it uses as much as digits as its factorization.

7989409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 7989409 is about 2826.5542627022. The cubic root of 7989409 is about 199.9117026903.

The spelling of 7989409 in words is "seven million, nine hundred eighty-nine thousand, four hundred nine".