399134810873 has 2 divisors, whose sum is σ = 399134810874. Its totient is φ = 399134810872.

The previous prime is 399134810863. The next prime is 399134810891. The reversal of 399134810873 is 378018431993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398801091049 + 333719824 = 631507^2 + 18268^2 .

It is a cyclic number.

It is not a de Polignac number, because 399134810873 - 2¹⁰ = 399134809849 is a prime.

It is not a weakly prime, because it can be changed into another prime (399134810863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199567405436 + 199567405437.

It is an arithmetic number, because the mean of its divisors is an integer number (199567405437).

Almost surely, 2^399134810873 is an apocalyptic number.

It is an amenable number.

399134810873 is a deficient number, since it is larger than the sum of its proper divisors (1).

399134810873 is an equidigital number, since it uses as much as digits as its factorization.

399134810873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 399134810873 in words is "three hundred ninety-nine billion, one hundred thirty-four million, eight hundred ten thousand, eight hundred seventy-three".