1440130521 has 4 divisors (see below), whose sum is σ = 1920174032. Its totient is φ = 960087012.

The previous prime is 1440130511. The next prime is 1440130529. The reversal of 1440130521 is 1250310441.

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 not a de Polignac number, because 1440130521 - 2⁹ = 1440130009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440130529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240021751 + ... + 240021756.

It is an arithmetic number, because the mean of its divisors is an integer number (480043508).

Almost surely, 2^1440130521 is an apocalyptic number.

It is an amenable number.

1440130521 is a deficient number, since it is larger than the sum of its proper divisors (480043511).

1440130521 is an equidigital number, since it uses as much as digits as its factorization.

1440130521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480043510.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1440130521 is about 37949.0516482296. The cubic root of 1440130521 is about 1129.2773516719.

Adding to 1440130521 its reverse (1250310441), we get a palindrome (2690440962).

The spelling of 1440130521 in words is "one billion, four hundred forty million, one hundred thirty thousand, five hundred twenty-one".