398478824873 has 4 divisors (see below), whose sum is σ = 398526675540. Its totient is φ = 398430974208.

The previous prime is 398478824839. The next prime is 398478824987. The reversal of 398478824873 is 378428874893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212749717504 + 185729107369 = 461248^2 + 430963^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398478824873 is a prime.

It is a super-2 number, since 2×398478824873² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398478824797 and 398478824806.

It is not an unprimeable number, because it can be changed into a prime (398478824273) 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 in 3 ways as a sum of consecutive naturals, for example, 23912840 + ... + 23929497.

It is an arithmetic number, because the mean of its divisors is an integer number (99631668885).

Almost surely, 2^398478824873 is an apocalyptic number.

It is an amenable number.

398478824873 is a deficient number, since it is larger than the sum of its proper divisors (47850667).

398478824873 is an equidigital number, since it uses as much as digits as its factorization.

398478824873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47850666.

The product of its digits is 520224768, while the sum is 71.

The spelling of 398478824873 in words is "three hundred ninety-eight billion, four hundred seventy-eight million, eight hundred twenty-four thousand, eight hundred seventy-three".