440909 has 4 divisors (see below), whose sum is σ = 503904. Its totient is φ = 377916.

The previous prime is 440903. The next prime is 440911. The reversal of 440909 is 909044.

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 440909 - 2⁴ = 440893 is a prime.

It is a Duffinian number.

440909 is a modest number, since divided by 909 gives 44 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440903) 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, 31487 + ... + 31500.

It is an arithmetic number, because the mean of its divisors is an integer number (125976).

2⁴⁴⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

440909 is a deficient number, since it is larger than the sum of its proper divisors (62995).

440909 is an equidigital number, since it uses as much as digits as its factorization.

440909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62994.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 440909 is about 664.0097890845. The cubic root of 440909 is about 76.1113902149. Note that the first 3 decimals are identical.

The spelling of 440909 in words is "four hundred forty thousand, nine hundred nine".