1338443861 has 2 divisors, whose sum is σ = 1338443862. Its totient is φ = 1338443860.

The previous prime is 1338443849. The next prime is 1338443947. The reversal of 1338443861 is 1683448331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 924524836 + 413919025 = 30406^2 + 20345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338443861 - 2¹⁰ = 1338442837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338440861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669221930 + 669221931.

It is an arithmetic number, because the mean of its divisors is an integer number (669221931).

Almost surely, 2^1338443861 is an apocalyptic number.

It is an amenable number.

1338443861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338443861 is an equidigital number, since it uses as much as digits as its factorization.

1338443861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 41.

The square root of 1338443861 is about 36584.7490219627. The cubic root of 1338443861 is about 1102.0468393678.

The spelling of 1338443861 in words is "one billion, three hundred thirty-eight million, four hundred forty-three thousand, eight hundred sixty-one".