1440221020 has 24 divisors (see below), whose sum is σ = 3456530784. Its totient is φ = 493790016.

The previous prime is 1440221017. The next prime is 1440221023. The reversal of 1440221020 is 201220441.

It is an interprime number because it is at equal distance from previous prime (1440221017) and next prime (1440221023).

It is a junction number, because it is equal to n+sod(n) for n = 1440220985 and 1440221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440221023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5143507 + ... + 5143786.

It is an arithmetic number, because the mean of its divisors is an integer number (144022116).

Almost surely, 2^1440221020 is an apocalyptic number.

1440221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440221020 is an abundant number, since it is smaller than the sum of its proper divisors (2016309764).

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

1440221020 is a wasteful number, since it uses less digits than its factorization.

1440221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10287309 (or 10287307 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1440221020 is about 37950.2440044857. The cubic root of 1440221020 is about 1129.3010060858.

Adding to 1440221020 its reverse (201220441), we get a palindrome (1641441461).

The spelling of 1440221020 in words is "one billion, four hundred forty million, two hundred twenty-one thousand, twenty".