398438773 has 2 divisors, whose sum is σ = 398438774. Its totient is φ = 398438772.

The previous prime is 398438771. The next prime is 398438851. The reversal of 398438773 is 377834893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313927524 + 84511249 = 17718^2 + 9193^2 .

It is a cyclic number.

It is not a de Polignac number, because 398438773 - 2¹ = 398438771 is a prime.

Together with 398438771, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 398438773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398438771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199219386 + 199219387.

It is an arithmetic number, because the mean of its divisors is an integer number (199219387).

Almost surely, 2^398438773 is an apocalyptic number.

It is an amenable number.

398438773 is a deficient number, since it is larger than the sum of its proper divisors (1).

398438773 is an equidigital number, since it uses as much as digits as its factorization.

398438773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 52.

The square root of 398438773 is about 19960.9311656546. The cubic root of 398438773 is about 735.8464482804.

The spelling of 398438773 in words is "three hundred ninety-eight million, four hundred thirty-eight thousand, seven hundred seventy-three".