1440040421 has 2 divisors, whose sum is σ = 1440040422. Its totient is φ = 1440040420.

The previous prime is 1440040411. The next prime is 1440040439. The reversal of 1440040421 is 1240400441.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1231237921 + 208802500 = 35089^2 + 14450^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440040421 - 2¹⁴ = 1440024037 is a prime.

It is a super-2 number, since 2×1440040421² = 4147432828227714482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1440040393 and 1440040402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440040411) 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 as a sum of consecutive naturals, namely, 720020210 + 720020211.

It is an arithmetic number, because the mean of its divisors is an integer number (720020211).

Almost surely, 2^1440040421 is an apocalyptic number.

It is an amenable number.

1440040421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440040421 is an equidigital number, since it uses as much as digits as its factorization.

1440040421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1440040421 is about 37947.8645117219. The cubic root of 1440040421 is about 1129.2538005632.

Adding to 1440040421 its reverse (1240400441), we get a palindrome (2680440862).

The spelling of 1440040421 in words is "one billion, four hundred forty million, forty thousand, four hundred twenty-one".