1440124421 has 2 divisors, whose sum is σ = 1440124422. Its totient is φ = 1440124420.

The previous prime is 1440124393. The next prime is 1440124423. The reversal of 1440124421 is 1244210441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1232361025 + 207763396 = 35105^2 + 14414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440124421 is a prime.

Together with 1440124423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440124423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720062210 + 720062211.

It is an arithmetic number, because the mean of its divisors is an integer number (720062211).

Almost surely, 2^1440124421 is an apocalyptic number.

It is an amenable number.

1440124421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440124421 is an equidigital number, since it uses as much as digits as its factorization.

1440124421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 1440124421 is about 37948.9712772296. The cubic root of 1440124421 is about 1129.2757572327.

Adding to 1440124421 its reverse (1244210441), we get a palindrome (2684334862).

The spelling of 1440124421 in words is "one billion, four hundred forty million, one hundred twenty-four thousand, four hundred twenty-one".