440025021 has 8 divisors (see below), whose sum is σ = 651888960. Its totient is φ = 293349996.

The previous prime is 440025013. The next prime is 440025041. The reversal of 440025021 is 120520044.

It is not a de Polignac number, because 440025021 - 2³ = 440025013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 440024985 and 440025003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440025041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8148585 + ... + 8148638.

It is an arithmetic number, because the mean of its divisors is an integer number (81486120).

Almost surely, 2^440025021 is an apocalyptic number.

It is an amenable number.

440025021 is a deficient number, since it is larger than the sum of its proper divisors (211863939).

440025021 is a wasteful number, since it uses less digits than its factorization.

440025021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16297232 (or 16297226 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 440025021 is about 20976.7733696105. The cubic root of 440025021 is about 760.6049091023.

Adding to 440025021 its reverse (120520044), we get a palindrome (560545065).

The spelling of 440025021 in words is "four hundred forty million, twenty-five thousand, twenty-one".