1444640413 has 2 divisors, whose sum is σ = 1444640414. Its totient is φ = 1444640412.

The previous prime is 1444640411. The next prime is 1444640437. The reversal of 1444640413 is 3140464441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972317124 + 472323289 = 31182^2 + 21733^2 .

It is a cyclic number.

It is not a de Polignac number, because 1444640413 - 2¹ = 1444640411 is a prime.

Together with 1444640411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1444640411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722320206 + 722320207.

It is an arithmetic number, because the mean of its divisors is an integer number (722320207).

Almost surely, 2^1444640413 is an apocalyptic number.

It is an amenable number.

1444640413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1444640413 is an equidigital number, since it uses as much as digits as its factorization.

1444640413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 1444640413 is about 38008.4255527640. The cubic root of 1444640413 is about 1130.4549328578.

The spelling of 1444640413 in words is "one billion, four hundred forty-four million, six hundred forty thousand, four hundred thirteen".