440542021 has 8 divisors (see below), whose sum is σ = 447075200. Its totient is φ = 434052432.

The previous prime is 440541979. The next prime is 440542033. The reversal of 440542021 is 120245044.

It is a happy number.

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

It is not a de Polignac number, because 440542021 - 2¹¹ = 440539973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 440541983 and 440542001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440542121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9751 + ... + 31243.

It is an arithmetic number, because the mean of its divisors is an integer number (55884400).

Almost surely, 2^440542021 is an apocalyptic number.

It is an amenable number.

440542021 is a deficient number, since it is larger than the sum of its proper divisors (6533179).

440542021 is a wasteful number, since it uses less digits than its factorization.

440542021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21795.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 440542021 is about 20989.0929056022. The cubic root of 440542021 is about 760.9026791625.

Adding to 440542021 its reverse (120245044), we get a palindrome (560787065).

The spelling of 440542021 in words is "four hundred forty million, five hundred forty-two thousand, twenty-one".