398889625779 has 6 divisors (see below), whose sum is σ = 576173903916. Its totient is φ = 265926417180.

The previous prime is 398889625763. The next prime is 398889625787. The reversal of 398889625779 is 977526988893.

398889625779 is a `hidden beast` number, since 39 + 8 + 8 + 8 + 9 + 6 + 2 + 577 + 9 = 666.

It is not a de Polignac number, because 398889625779 - 2⁴ = 398889625763 is a prime.

It is a super-2 number, since 2×398889625779² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398889625698 and 398889625707.

It is not an unprimeable number, because it can be changed into a prime (398889625279) 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 in 5 ways as a sum of consecutive naturals, for example, 22160534757 + ... + 22160534774.

It is an arithmetic number, because the mean of its divisors is an integer number (96028983986).

Almost surely, 2^398889625779 is an apocalyptic number.

398889625779 is a deficient number, since it is larger than the sum of its proper divisors (177284278137).

398889625779 is a wasteful number, since it uses less digits than its factorization.

398889625779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44321069537 (or 44321069534 counting only the distinct ones).

The product of its digits is 3292047360, while the sum is 81.

The spelling of 398889625779 in words is "three hundred ninety-eight billion, eight hundred eighty-nine million, six hundred twenty-five thousand, seven hundred seventy-nine".