8019989 has 2 divisors, whose sum is σ = 8019990. Its totient is φ = 8019988.

The previous prime is 8019983. The next prime is 8019997. The reversal of 8019989 is 9899108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7102225 + 917764 = 2665^2 + 958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8019989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8019983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4009994 + 4009995.

It is an arithmetic number, because the mean of its divisors is an integer number (4009995).

Almost surely, 2^8019989 is an apocalyptic number.

It is an amenable number.

8019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8019989 is an equidigital number, since it uses as much as digits as its factorization.

8019989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 8019989 is about 2831.9585095831. The cubic root of 8019989 is about 200.1664364561.

The spelling of 8019989 in words is "eight million, nineteen thousand, nine hundred eighty-nine".