1440664447 has 2 divisors, whose sum is σ = 1440664448. Its totient is φ = 1440664446.

The previous prime is 1440664441. The next prime is 1440664451. The reversal of 1440664447 is 7444660441.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440664447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440664441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720332223 + 720332224.

It is an arithmetic number, because the mean of its divisors is an integer number (720332224).

Almost surely, 2^1440664447 is an apocalyptic number.

1440664447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440664447 is an equidigital number, since it uses as much as digits as its factorization.

1440664447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 40.

The square root of 1440664447 is about 37956.0857702688. The cubic root of 1440664447 is about 1129.4168936628.

The spelling of 1440664447 in words is "one billion, four hundred forty million, six hundred sixty-four thousand, four hundred forty-seven".