1392538682809 has 2 divisors, whose sum is σ = 1392538682810. Its totient is φ = 1392538682808.

The previous prime is 1392538682779. The next prime is 1392538682819. The reversal of 1392538682809 is 9082868352931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 910062576784 + 482476106025 = 953972^2 + 694605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1392538682809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1392538682819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696269341404 + 696269341405.

It is an arithmetic number, because the mean of its divisors is an integer number (696269341405).

Almost surely, 2^{1392538682809} is an apocalyptic number.

It is an amenable number.

1392538682809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1392538682809 is an equidigital number, since it uses as much as digits as its factorization.

1392538682809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44789760, while the sum is 64.

The spelling of 1392538682809 in words is "one trillion, three hundred ninety-two billion, five hundred thirty-eight million, six hundred eighty-two thousand, eight hundred nine".