398843405 has 4 divisors (see below), whose sum is σ = 478612092. Its totient is φ = 319074720.

The previous prime is 398843399. The next prime is 398843407. The reversal of 398843405 is 504348893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504348893 = 9127 ⋅55259.

It can be written as a sum of positive squares in 2 ways, for example, as 248976841 + 149866564 = 15779^2 + 12242^2 .

It is not a de Polignac number, because 398843405 - 2²⁴ = 382066189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398843407) by changing a digit.

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, 39884336 + ... + 39884345.

It is an arithmetic number, because the mean of its divisors is an integer number (119653023).

Almost surely, 2^398843405 is an apocalyptic number.

It is an amenable number.

398843405 is a deficient number, since it is larger than the sum of its proper divisors (79768687).

398843405 is an equidigital number, since it uses as much as digits as its factorization.

398843405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79768686.

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 398843405 is about 19971.0641929768. The cubic root of 398843405 is about 736.0954587561.

The spelling of 398843405 in words is "three hundred ninety-eight million, eight hundred forty-three thousand, four hundred five".