440400020 has 24 divisors (see below), whose sum is σ = 925411200. Its totient is φ = 176051232.

The previous prime is 440400017. The next prime is 440400029. The reversal of 440400020 is 20004044.

It is a junction number, because it is equal to n+sod(n) for n = 440399968 and 440400004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440400029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31721 + ... + 43439.

It is an arithmetic number, because the mean of its divisors is an integer number (38558800).

Almost surely, 2^440400020 is an apocalyptic number.

It is an amenable number.

440400020 is an abundant number, since it is smaller than the sum of its proper divisors (485011180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

440400020 is a wasteful number, since it uses less digits than its factorization.

440400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13607 (or 13605 counting only the distinct ones).

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

The square root of 440400020 is about 20985.7098998342. The cubic root of 440400020 is about 760.8209158289.

Adding to 440400020 its reverse (20004044), we get a palindrome (460404064).

The spelling of 440400020 in words is "four hundred forty million, four hundred thousand, twenty".