8247989 has 4 divisors (see below), whose sum is σ = 8293740. Its totient is φ = 8202240.

The previous prime is 8247973. The next prime is 8247991. The reversal of 8247989 is 9897428.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3591025 + 4656964 = 1895^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 8247989 - 2⁴ = 8247973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8247949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22604 + ... + 22965.

It is an arithmetic number, because the mean of its divisors is an integer number (2073435).

Almost surely, 2^8247989 is an apocalyptic number.

It is an amenable number.

8247989 is a deficient number, since it is larger than the sum of its proper divisors (45751).

8247989 is a wasteful number, since it uses less digits than its factorization.

8247989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45750.

The product of its digits is 290304, while the sum is 47.

The square root of 8247989 is about 2871.9312317672. The cubic root of 8247989 is about 202.0455816491.

The spelling of 8247989 in words is "eight million, two hundred forty-seven thousand, nine hundred eighty-nine".