398464813 has 2 divisors, whose sum is σ = 398464814. Its totient is φ = 398464812.

The previous prime is 398464799. The next prime is 398464831. The reversal of 398464813 is 318464893.

Together with next prime (398464831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 350550729 + 47914084 = 18723^2 + 6922^2 .

It is a cyclic number.

It is not a de Polignac number, because 398464813 - 2⁹ = 398464301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398464883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199232406 + 199232407.

It is an arithmetic number, because the mean of its divisors is an integer number (199232407).

Almost surely, 2^398464813 is an apocalyptic number.

It is an amenable number.

398464813 is a deficient number, since it is larger than the sum of its proper divisors (1).

398464813 is an equidigital number, since it uses as much as digits as its factorization.

398464813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The square root of 398464813 is about 19961.5834291772. The cubic root of 398464813 is about 735.8624783670.

The spelling of 398464813 in words is "three hundred ninety-eight million, four hundred sixty-four thousand, eight hundred thirteen".