8440989 has 4 divisors (see below), whose sum is σ = 11254656. Its totient is φ = 5627324.

The previous prime is 8440979. The next prime is 8441009. The reversal of 8440989 is 9890448.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8440989 - 2⁴ = 8440973 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8440989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8440919) 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, 1406829 + ... + 1406834.

It is an arithmetic number, because the mean of its divisors is an integer number (2813664).

Almost surely, 2^8440989 is an apocalyptic number.

It is an amenable number.

8440989 is a deficient number, since it is larger than the sum of its proper divisors (2813667).

8440989 is a wasteful number, since it uses less digits than its factorization.

8440989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813666.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 8440989 is about 2905.3380182003. The cubic root of 8440989 is about 203.6093784238.

The spelling of 8440989 in words is "eight million, four hundred forty thousand, nine hundred eighty-nine".