440009 has 2 divisors, whose sum is σ = 440010. Its totient is φ = 440008.

The previous prime is 439991. The next prime is 440023. The reversal of 440009 is 900044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366025 + 73984 = 605^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 440009 - 2⁸ = 439753 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (440039) 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 as a sum of consecutive naturals, namely, 220004 + 220005.

It is an arithmetic number, because the mean of its divisors is an integer number (220005).

2⁴⁴⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

440009 is a deficient number, since it is larger than the sum of its proper divisors (1).

440009 is an equidigital number, since it uses as much as digits as its factorization.

440009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 440009 is about 663.3317420416. The cubic root of 440009 is about 76.0595677961.

The spelling of 440009 in words is "four hundred forty thousand, nine".