440309 has 4 divisors (see below), whose sum is σ = 443904. Its totient is φ = 436716.

The previous prime is 440303. The next prime is 440311. The reversal of 440309 is 903044.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440309 is a prime.

It is a Duffinian number.

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 440309.

It is not an unprimeable number, because it can be changed into a prime (440303) 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, 1607 + ... + 1860.

It is an arithmetic number, because the mean of its divisors is an integer number (110976).

2⁴⁴⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

440309 is a deficient number, since it is larger than the sum of its proper divisors (3595).

440309 is a wasteful number, since it uses less digits than its factorization.

440309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 440309 is about 663.5578347062. The cubic root of 440309 is about 76.0768497809.

The spelling of 440309 in words is "four hundred forty thousand, three hundred nine".