1021440440 has 32 divisors (see below), whose sum is σ = 2311541280. Its totient is φ = 406211712.

The previous prime is 1021440439. The next prime is 1021440449. The reversal of 1021440440 is 440441201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021440449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66884 + ... + 80723.

It is an arithmetic number, because the mean of its divisors is an integer number (72235665).

Almost surely, 2^1021440440 is an apocalyptic number.

1021440440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021440440 is an abundant number, since it is smaller than the sum of its proper divisors (1290100840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021440440 is a wasteful number, since it uses less digits than its factorization.

1021440440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147791 (or 147787 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1021440440 is about 31959.9818523102. The cubic root of 1021440440 is about 1007.0963362264.

Adding to 1021440440 its reverse (440441201), we get a palindrome (1461881641).

The spelling of 1021440440 in words is "one billion, twenty-one million, four hundred forty thousand, four hundred forty".