440522021 has 4 divisors (see below), whose sum is σ = 440614944. Its totient is φ = 440429100.

The previous prime is 440522009. The next prime is 440522041. The reversal of 440522021 is 120225044.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-440522021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 440521984 and 440522002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440522041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38945 + ... + 48966.

It is an arithmetic number, because the mean of its divisors is an integer number (110153736).

Almost surely, 2^440522021 is an apocalyptic number.

It is an amenable number.

440522021 is a deficient number, since it is larger than the sum of its proper divisors (92923).

440522021 is an equidigital number, since it uses as much as digits as its factorization.

440522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92922.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 440522021 is about 20988.6164622635. The cubic root of 440522021 is about 760.8911643443.

Adding to 440522021 its reverse (120225044), we get a palindrome (560747065).

The spelling of 440522021 in words is "four hundred forty million, five hundred twenty-two thousand, twenty-one".