1339821817 has 2 divisors, whose sum is σ = 1339821818. Its totient is φ = 1339821816.

The previous prime is 1339821797. The next prime is 1339821851. The reversal of 1339821817 is 7181289331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1100315241 + 239506576 = 33171^2 + 15476^2 .

It is a cyclic number.

It is not a de Polignac number, because 1339821817 - 2¹¹ = 1339819769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1339821887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669910908 + 669910909.

It is an arithmetic number, because the mean of its divisors is an integer number (669910909).

Almost surely, 2^1339821817 is an apocalyptic number.

It is an amenable number.

1339821817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1339821817 is an equidigital number, since it uses as much as digits as its factorization.

1339821817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 1339821817 is about 36603.5765602215. The cubic root of 1339821817 is about 1102.4249030936.

The spelling of 1339821817 in words is "one billion, three hundred thirty-nine million, eight hundred twenty-one thousand, eight hundred seventeen".