1440633421 has 4 divisors (see below), whose sum is σ = 1440897952. Its totient is φ = 1440368892.

The previous prime is 1440633373. The next prime is 1440633473. The reversal of 1440633421 is 1243360441.

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 a cyclic number.

It is not a de Polignac number, because 1440633421 - 2¹¹ = 1440631373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1440633421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440633721) 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 3 ways as a sum of consecutive naturals, for example, 123921 + ... + 135046.

It is an arithmetic number, because the mean of its divisors is an integer number (360224488).

Almost surely, 2^1440633421 is an apocalyptic number.

It is an amenable number.

1440633421 is a deficient number, since it is larger than the sum of its proper divisors (264531).

1440633421 is an equidigital number, since it uses as much as digits as its factorization.

1440633421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264530.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 1440633421 is about 37955.6770589065. The cubic root of 1440633421 is about 1129.4087859363.

Adding to 1440633421 its reverse (1243360441), we get a palindrome (2683993862).

The spelling of 1440633421 in words is "one billion, four hundred forty million, six hundred thirty-three thousand, four hundred twenty-one".