1440332421 has 8 divisors (see below), whose sum is σ = 2095029024. Its totient is φ = 872928720.

The previous prime is 1440332393. The next prime is 1440332459. The reversal of 1440332421 is 1242330441.

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

It is not a de Polignac number, because 1440332421 - 2⁵ = 1440332389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1440332391 and 1440332400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440332321) 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, 21823186 + ... + 21823251.

It is an arithmetic number, because the mean of its divisors is an integer number (261878628).

Almost surely, 2^1440332421 is an apocalyptic number.

1440332421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1440332421 is a deficient number, since it is larger than the sum of its proper divisors (654696603).

1440332421 is a wasteful number, since it uses less digits than its factorization.

1440332421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43646451.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1440332421 is about 37951.7117005281. The cubic root of 1440332421 is about 1129.3301224543.

Adding to 1440332421 its reverse (1242330441), we get a palindrome (2682662862).

It can be divided in two parts, 1440332 and 421, that added together give a triangular number (1440753 = T₁₆₉₇).

The spelling of 1440332421 in words is "one billion, four hundred forty million, three hundred thirty-two thousand, four hundred twenty-one".