1438945649 has 2 divisors, whose sum is σ = 1438945650. Its totient is φ = 1438945648.

The previous prime is 1438945609. The next prime is 1438945657. The reversal of 1438945649 is 9465498341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 829843249 + 609102400 = 28807^2 + 24680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438945649 - 2⁸ = 1438945393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1438945649.

It is not a weakly prime, because it can be changed into another prime (1438945609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719472824 + 719472825.

It is an arithmetic number, because the mean of its divisors is an integer number (719472825).

Almost surely, 2^1438945649 is an apocalyptic number.

It is an amenable number.

1438945649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438945649 is an equidigital number, since it uses as much as digits as its factorization.

1438945649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 53.

The square root of 1438945649 is about 37933.4370839237. The cubic root of 1438945649 is about 1128.9675611763.

The spelling of 1438945649 in words is "one billion, four hundred thirty-eight million, nine hundred forty-five thousand, six hundred forty-nine".