1440320431 has 8 divisors (see below), whose sum is σ = 1572064128. Its totient is φ = 1308711000.

The previous prime is 1440320417. The next prime is 1440320443. The reversal of 1440320431 is 1340230441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1440320431 - 2⁹ = 1440319919 is a prime.

It is a super-3 number, since 3×1440320431³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440320831) 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, 10435 + ... + 54676.

It is an arithmetic number, because the mean of its divisors is an integer number (196508016).

Almost surely, 2^1440320431 is an apocalyptic number.

1440320431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1440320431 is a deficient number, since it is larger than the sum of its proper divisors (131743697).

1440320431 is a wasteful number, since it uses less digits than its factorization.

1440320431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67133.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1440320431 is about 37951.5537363097. The cubic root of 1440320431 is about 1129.3269887551.

Adding to 1440320431 its reverse (1340230441), we get a palindrome (2780550872).

The spelling of 1440320431 in words is "one billion, four hundred forty million, three hundred twenty thousand, four hundred thirty-one".