1440649421 has 2 divisors, whose sum is σ = 1440649422. Its totient is φ = 1440649420.

The previous prime is 1440649387. The next prime is 1440649439. The reversal of 1440649421 is 1249460441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1363455625 + 77193796 = 36925^2 + 8786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440649421 - 2¹⁰ = 1440648397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440646421) 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, 720324710 + 720324711.

It is an arithmetic number, because the mean of its divisors is an integer number (720324711).

Almost surely, 2^1440649421 is an apocalyptic number.

It is an amenable number.

1440649421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440649421 is an equidigital number, since it uses as much as digits as its factorization.

1440649421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1440649421 is about 37955.8878304803. The cubic root of 1440649421 is about 1129.4129670771.

The spelling of 1440649421 in words is "one billion, four hundred forty million, six hundred forty-nine thousand, four hundred twenty-one".