8641989 has 12 divisors (see below), whose sum is σ = 12624300. Its totient is φ = 5696064.

The previous prime is 8641987. The next prime is 8641991. The reversal of 8641989 is 9891468.

It is an interprime number because it is at equal distance from previous prime (8641987) and next prime (8641991).

It can be written as a sum of positive squares in 2 ways, for example, as 2722500 + 5919489 = 1650^2 + 2433^2 .

It is not a de Polignac number, because 8641989 - 2¹ = 8641987 is a prime.

It is a super-2 number, since 2×8641989² = 149367947752242, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8641987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4594 + ... + 6195.

It is an arithmetic number, because the mean of its divisors is an integer number (1052025).

Almost surely, 2^8641989 is an apocalyptic number.

8641989 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

8641989 is a deficient number, since it is larger than the sum of its proper divisors (3982311).

8641989 is a wasteful number, since it uses less digits than its factorization.

8641989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10884 (or 10881 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 8641989 is about 2939.7260076408. The cubic root of 8641989 is about 205.2128584216.

The spelling of 8641989 in words is "eight million, six hundred forty-one thousand, nine hundred eighty-nine".