1438778713 has 2 divisors, whose sum is σ = 1438778714. Its totient is φ = 1438778712.

The previous prime is 1438778699. The next prime is 1438778723. The reversal of 1438778713 is 3178778341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1014295104 + 424483609 = 31848^2 + 20603^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438778713 - 2¹³ = 1438770521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1438778723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719389356 + 719389357.

It is an arithmetic number, because the mean of its divisors is an integer number (719389357).

Almost surely, 2^1438778713 is an apocalyptic number.

It is an amenable number.

1438778713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438778713 is an equidigital number, since it uses as much as digits as its factorization.

1438778713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 49.

The square root of 1438778713 is about 37931.2366394770. The cubic root of 1438778713 is about 1128.9239012884.

The spelling of 1438778713 in words is "one billion, four hundred thirty-eight million, seven hundred seventy-eight thousand, seven hundred thirteen".