440018 has 4 divisors (see below), whose sum is σ = 660030. Its totient is φ = 220008.

The previous prime is 440009. The next prime is 440023. The reversal of 440018 is 810044.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 413449 + 26569 = 643^2 + 163^2 .

It is a junction number, because it is equal to n+sod(n) for n = 439978 and 440005.

It is an unprimeable number.

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, 110003 + ... + 110006.

2⁴⁴⁰⁰¹⁸ is an apocalyptic number.

440018 is a deficient number, since it is larger than the sum of its proper divisors (220012).

440018 is a wasteful number, since it uses less digits than its factorization.

440018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220011.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 440018 is about 663.3385259428. The cubic root of 440018 is about 76.0600863699.

The spelling of 440018 in words is "four hundred forty thousand, eighteen".