440109 has 12 divisors (see below), whose sum is σ = 644800. Its totient is φ = 289224.

The previous prime is 440101. The next prime is 440131. The reversal of 440109 is 901044.

It is not a de Polignac number, because 440109 - 2³ = 440101 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

440109 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 440091 and 440100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 402 + ... + 1020.

2⁴⁴⁰¹⁰⁹ is an apocalyptic number.

It is an amenable number.

440109 is a deficient number, since it is larger than the sum of its proper divisors (204691).

440109 is a wasteful number, since it uses less digits than its factorization.

440109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 440109 is about 663.4071148247. The cubic root of 440109 is about 76.0653293303.

The spelling of 440109 in words is "four hundred forty thousand, one hundred nine".