8015989 has 2 divisors, whose sum is σ = 8015990. Its totient is φ = 8015988.

The previous prime is 8015981. The next prime is 8016023. The reversal of 8015989 is 9895108.

8015989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5267025 + 2748964 = 2295^2 + 1658^2 .

It is a cyclic number.

It is not a de Polignac number, because 8015989 - 2³ = 8015981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8015981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4007994 + 4007995.

It is an arithmetic number, because the mean of its divisors is an integer number (4007995).

Almost surely, 2^8015989 is an apocalyptic number.

It is an amenable number.

8015989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8015989 is an equidigital number, since it uses as much as digits as its factorization.

8015989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 8015989 is about 2831.2521964671. The cubic root of 8015989 is about 200.1331529984.

The spelling of 8015989 in words is "eight million, fifteen thousand, nine hundred eighty-nine".