440139 has 8 divisors (see below), whose sum is σ = 670720. Its totient is φ = 251496.

The previous prime is 440131. The next prime is 440159. The reversal of 440139 is 931044.

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

It is not a de Polignac number, because 440139 - 2³ = 440131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 20959 = 440139 / (4 + 4 + 0 + 1 + 3 + 9).

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 440139.

It is not an unprimeable number, because it can be changed into a prime (440131) 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, 10459 + ... + 10500.

It is an arithmetic number, because the mean of its divisors is an integer number (83840).

2⁴⁴⁰¹³⁹ is an apocalyptic number.

440139 is a deficient number, since it is larger than the sum of its proper divisors (230581).

440139 is a wasteful number, since it uses less digits than its factorization.

440139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20969.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 440139 is about 663.4297249898. The cubic root of 440139 is about 76.0670576203.

The spelling of 440139 in words is "four hundred forty thousand, one hundred thirty-nine".