8440689 has 4 divisors (see below), whose sum is σ = 11254256. Its totient is φ = 5627124.

The previous prime is 8440673. The next prime is 8440703. The reversal of 8440689 is 9860448.

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 not a de Polignac number, because 8440689 - 2⁴ = 8440673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8440639) 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, 1406779 + ... + 1406784.

It is an arithmetic number, because the mean of its divisors is an integer number (2813564).

Almost surely, 2^8440689 is an apocalyptic number.

It is an amenable number.

8440689 is a deficient number, since it is larger than the sum of its proper divisors (2813567).

8440689 is a wasteful number, since it uses less digits than its factorization.

8440689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813566.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 8440689 is about 2905.2863886371. The cubic root of 8440689 is about 203.6069662445.

The spelling of 8440689 in words is "eight million, four hundred forty thousand, six hundred eighty-nine".