440424021 has 8 divisors (see below), whose sum is σ = 589797280. Its totient is φ = 292333392.

The previous prime is 440424013. The next prime is 440424041. The reversal of 440424021 is 120424044.

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

It is not a de Polignac number, because 440424021 - 2³ = 440424013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440424001) 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, 319855 + ... + 321228.

It is an arithmetic number, because the mean of its divisors is an integer number (73724660).

Almost surely, 2^440424021 is an apocalyptic number.

It is an amenable number.

440424021 is a deficient number, since it is larger than the sum of its proper divisors (149373259).

440424021 is a wasteful number, since it uses less digits than its factorization.

440424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641315.

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 440424021 is about 20986.2817335516. The cubic root of 440424021 is about 760.8347366965.

Adding to 440424021 its reverse (120424044), we get a palindrome (560848065).

The spelling of 440424021 in words is "four hundred forty million, four hundred twenty-four thousand, twenty-one".