440042 has 4 divisors (see below), whose sum is σ = 660066. Its totient is φ = 220020.

The previous prime is 440039. The next prime is 440047. The reversal of 440042 is 240044.

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., 323761 + 116281 = 569^2 + 341^2 .

It is a junction number, because it is equal to n+sod(n) for n = 439999 and 440026.

It is not an unprimeable number, because it can be changed into a prime (440047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110009 + ... + 110012.

2⁴⁴⁰⁰⁴² is an apocalyptic number.

440042 is a deficient number, since it is larger than the sum of its proper divisors (220024).

440042 is a wasteful number, since it uses less digits than its factorization.

440042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220023.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 440042 is about 663.3566160068. The cubic root of 440042 is about 76.0614691989.

Adding to 440042 its reverse (240044), we get a palindrome (680086).

The spelling of 440042 in words is "four hundred forty thousand, forty-two", and thus it is an iban number.