1440442421 has 8 divisors (see below), whose sum is σ = 1654096800. Its totient is φ = 1240572240.

The previous prime is 1440442397. The next prime is 1440442433. The reversal of 1440442421 is 1242440441.

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 1440442421 - 2⁶ = 1440442357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440442021) 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, 3445826 + ... + 3446243.

It is an arithmetic number, because the mean of its divisors is an integer number (206762100).

Almost surely, 2^1440442421 is an apocalyptic number.

1440442421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1440442421 is a deficient number, since it is larger than the sum of its proper divisors (213654379).

1440442421 is a wasteful number, since it uses less digits than its factorization.

1440442421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6892099.

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 1440442421 is about 37953.1608828566. The cubic root of 1440442421 is about 1129.3588711768.

Adding to 1440442421 its reverse (1242440441), we get a palindrome (2682882862).

The spelling of 1440442421 in words is "one billion, four hundred forty million, four hundred forty-two thousand, four hundred twenty-one".