440230021 has 16 divisors (see below), whose sum is σ = 549324288. Its totient is φ = 342745200.

The previous prime is 440230009. The next prime is 440230027. The reversal of 440230021 is 120032044.

It is not a de Polignac number, because 440230021 - 2⁹ = 440229509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 440229977 and 440230004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440230027) 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 15 ways as a sum of consecutive naturals, for example, 153426 + ... + 156268.

It is an arithmetic number, because the mean of its divisors is an integer number (34332768).

Almost surely, 2^440230021 is an apocalyptic number.

It is an amenable number.

440230021 is a deficient number, since it is larger than the sum of its proper divisors (109094267).

440230021 is a wasteful number, since it uses less digits than its factorization.

440230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 440230021 is about 20981.6591574642. The cubic root of 440230021 is about 760.7230082944.

Adding to 440230021 its reverse (120032044), we get a palindrome (560262065).

The spelling of 440230021 in words is "four hundred forty million, two hundred thirty thousand, twenty-one".