393739173889 has 2 divisors, whose sum is σ = 393739173890. Its totient is φ = 393739173888.

The previous prime is 393739173871. The next prime is 393739173941. The reversal of 393739173889 is 988371937393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328979103489 + 64760070400 = 573567^2 + 254480^2 .

It is a cyclic number.

It is not a de Polignac number, because 393739173889 - 2¹¹ = 393739171841 is a prime.

It is not a weakly prime, because it can be changed into another prime (393739173589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196869586944 + 196869586945.

It is an arithmetic number, because the mean of its divisors is an integer number (196869586945).

Almost surely, 2^393739173889 is an apocalyptic number.

It is an amenable number.

393739173889 is a deficient number, since it is larger than the sum of its proper divisors (1).

393739173889 is an equidigital number, since it uses as much as digits as its factorization.

393739173889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185177664, while the sum is 70.

The spelling of 393739173889 in words is "three hundred ninety-three billion, seven hundred thirty-nine million, one hundred seventy-three thousand, eight hundred eighty-nine".