398088805 has 4 divisors (see below), whose sum is σ = 477706572. Its totient is φ = 318471040.

The previous prime is 398088799. The next prime is 398088839. The reversal of 398088805 is 508880893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508880893 = 29 ⋅17547617.

It can be written as a sum of positive squares in 2 ways, for example, as 184987201 + 213101604 = 13601^2 + 14598^2 .

It is not a de Polignac number, because 398088805 - 2⁹ = 398088293 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39808876 + ... + 39808885.

It is an arithmetic number, because the mean of its divisors is an integer number (119426643).

Almost surely, 2^398088805 is an apocalyptic number.

It is an amenable number.

398088805 is a deficient number, since it is larger than the sum of its proper divisors (79617767).

398088805 is an equidigital number, since it uses as much as digits as its factorization.

398088805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79617766.

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 398088805 is about 19952.1629153333. The cubic root of 398088805 is about 735.6309420242.

It can be divided in two parts, 398088 and 805, that added together give a palindrome (398893).

The spelling of 398088805 in words is "three hundred ninety-eight million, eighty-eight thousand, eight hundred five".