7989449869 has 2 divisors, whose sum is σ = 7989449870. Its totient is φ = 7989449868.

The previous prime is 7989449827. The next prime is 7989449987. The reversal of 7989449869 is 9689449897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4414007844 + 3575442025 = 66438^2 + 59795^2 .

It is a cyclic number.

It is not a de Polignac number, because 7989449869 - 2²¹ = 7987352717 is a prime.

It is a super-2 number, since 2×7989449869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7989446869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3994724934 + 3994724935.

It is an arithmetic number, because the mean of its divisors is an integer number (3994724935).

Almost surely, 2^7989449869 is an apocalyptic number.

It is an amenable number.

7989449869 is a deficient number, since it is larger than the sum of its proper divisors (1).

7989449869 is an equidigital number, since it uses as much as digits as its factorization.

7989449869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282175488, while the sum is 73.

The square root of 7989449869 is about 89383.7226177116. The cubic root of 7989449869 is about 1999.1204356567.

The spelling of 7989449869 in words is "seven billion, nine hundred eighty-nine million, four hundred forty-nine thousand, eight hundred sixty-nine".