1789391239873 has 2 divisors, whose sum is σ = 1789391239874. Its totient is φ = 1789391239872.

The previous prime is 1789391239787. The next prime is 1789391239901. The reversal of 1789391239873 is 3789321939871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1742418480049 + 46972759824 = 1320007^2 + 216732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1789391239873 is a prime.

It is a super-2 number, since 2×1789391239873² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1789391239973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 894695619936 + 894695619937.

It is an arithmetic number, because the mean of its divisors is an integer number (894695619937).

Almost surely, 2^{1789391239873} is an apocalyptic number.

It is an amenable number.

1789391239873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1789391239873 is an equidigital number, since it uses as much as digits as its factorization.

1789391239873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123451776, while the sum is 70.

The spelling of 1789391239873 in words is "one trillion, seven hundred eighty-nine billion, three hundred ninety-one million, two hundred thirty-nine thousand, eight hundred seventy-three".