440689 has 4 divisors (see below), whose sum is σ = 443124. Its totient is φ = 438256.

The previous prime is 440683. The next prime is 440711. The reversal of 440689 is 986044.

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 400689 + 40000 = 633^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 440689 - 2³ = 440681 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 440689.

It is not an unprimeable number, because it can be changed into a prime (440681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (110781).

2⁴⁴⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

440689 is a deficient number, since it is larger than the sum of its proper divisors (2435).

440689 is a wasteful number, since it uses less digits than its factorization.

440689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 440689 is about 663.8441082061. The cubic root of 440689 is about 76.0987290296.

The spelling of 440689 in words is "four hundred forty thousand, six hundred eighty-nine".