440645 has 4 divisors (see below), whose sum is σ = 528780. Its totient is φ = 352512.

The previous prime is 440641. The next prime is 440651. The reversal of 440645 is 546044.

It is a happy number.

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 128164 + 312481 = 358^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 440645 - 2² = 440641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 440645.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 440645.

It is not an unprimeable number, because it can be changed into a prime (440641) 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, 44060 + ... + 44069.

It is an arithmetic number, because the mean of its divisors is an integer number (132195).

2⁴⁴⁰⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

440645 is a deficient number, since it is larger than the sum of its proper divisors (88135).

440645 is an equidigital number, since it uses as much as digits as its factorization.

440645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88134.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 440645 is about 663.8109670682. The cubic root of 440645 is about 76.0961962870.

Adding to 440645 its reverse (546044), we get a palindrome (986689).

The spelling of 440645 in words is "four hundred forty thousand, six hundred forty-five".