440389609 has 4 divisors (see below), whose sum is σ = 480425040. Its totient is φ = 400354180.

The previous prime is 440389597. The next prime is 440389613. The reversal of 440389609 is 906983044.

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 not a de Polignac number, because 440389609 - 2¹⁵ = 440356841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (440389699) 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, 20017699 + ... + 20017720.

It is an arithmetic number, because the mean of its divisors is an integer number (120106260).

Almost surely, 2^440389609 is an apocalyptic number.

It is an amenable number.

440389609 is a deficient number, since it is larger than the sum of its proper divisors (40035431).

440389609 is a wasteful number, since it uses less digits than its factorization.

440389609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40035430.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 440389609 is about 20985.4618486227. The cubic root of 440389609 is about 760.8149205454.

The spelling of 440389609 in words is "four hundred forty million, three hundred eighty-nine thousand, six hundred nine".