440643 has 8 divisors (see below), whose sum is σ = 671488. Its totient is φ = 251784.

The previous prime is 440641. The next prime is 440651. The reversal of 440643 is 346044.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 440643 - 2¹ = 440641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 20983 = 440643 / (4 + 4 + 0 + 6 + 4 + 3).

It is a Duffinian number.

440643 is a lucky number.

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 7 ways as a sum of consecutive naturals, for example, 10471 + ... + 10512.

It is an arithmetic number, because the mean of its divisors is an integer number (83936).

2⁴⁴⁰⁶⁴³ is an apocalyptic number.

440643 is a deficient number, since it is larger than the sum of its proper divisors (230845).

440643 is a wasteful number, since it uses less digits than its factorization.

440643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20993.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 440643 is about 663.8094606135. The cubic root of 440643 is about 76.0960811583.

Adding to 440643 its reverse (346044), we get a palindrome (786687).

The spelling of 440643 in words is "four hundred forty thousand, six hundred forty-three".