440409 has 8 divisors (see below), whose sum is σ = 595552. Its totient is φ = 289440.

The previous prime is 440399. The next prime is 440431. The reversal of 440409 is 904044.

It is a happy number.

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

It is not a de Polignac number, because 440409 - 2⁴ = 440393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (440009) 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, 787 + ... + 1224.

It is an arithmetic number, because the mean of its divisors is an integer number (74444).

2⁴⁴⁰⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

440409 is a deficient number, since it is larger than the sum of its proper divisors (155143).

440409 is a wasteful number, since it uses less digits than its factorization.

440409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 440409 is about 663.6331818106. The cubic root of 440409 is about 76.0826086980.

The spelling of 440409 in words is "four hundred forty thousand, four hundred nine".