398846813 has 2 divisors, whose sum is σ = 398846814. Its totient is φ = 398846812.

The previous prime is 398846771. The next prime is 398846821. The reversal of 398846813 is 318648893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385611769 + 13235044 = 19637^2 + 3638^2 .

It is an emirp because it is prime and its reverse (318648893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398846813 - 2²² = 394652509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398846863) 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 as a sum of consecutive naturals, namely, 199423406 + 199423407.

It is an arithmetic number, because the mean of its divisors is an integer number (199423407).

Almost surely, 2^398846813 is an apocalyptic number.

It is an amenable number.

398846813 is a deficient number, since it is larger than the sum of its proper divisors (1).

398846813 is an equidigital number, since it uses as much as digits as its factorization.

398846813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 50.

The square root of 398846813 is about 19971.1495162397. The cubic root of 398846813 is about 736.0975553234.

The spelling of 398846813 in words is "three hundred ninety-eight million, eight hundred forty-six thousand, eight hundred thirteen".