1440320321 has 4 divisors (see below), whose sum is σ = 1571258544. Its totient is φ = 1309382100.

The previous prime is 1440320269. The next prime is 1440320333. The reversal of 1440320321 is 1230230441.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1230230441 = 11 ⋅111839131.

It is a cyclic number.

It is not a de Polignac number, because 1440320321 - 2¹⁰ = 1440319297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1440320293 and 1440320302.

It is not an unprimeable number, because it can be changed into a prime (1440320381) 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, 65469095 + ... + 65469116.

It is an arithmetic number, because the mean of its divisors is an integer number (392814636).

Almost surely, 2^1440320321 is an apocalyptic number.

1440320321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1440320321 is a deficient number, since it is larger than the sum of its proper divisors (130938223).

1440320321 is a wasteful number, since it uses less digits than its factorization.

1440320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130938222.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1440320321 is about 37951.5522870936. The cubic root of 1440320321 is about 1129.3269600055.

Adding to 1440320321 its reverse (1230230441), we get a palindrome (2670550762).

The spelling of 1440320321 in words is "one billion, four hundred forty million, three hundred twenty thousand, three hundred twenty-one".