398043805 has 4 divisors (see below), whose sum is σ = 477652572. Its totient is φ = 318435040.

The previous prime is 398043803. The next prime is 398043823. The reversal of 398043805 is 508340893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508340893 = 1373 ⋅370241.

It can be written as a sum of positive squares in 2 ways, for example, as 249545209 + 148498596 = 15797^2 + 12186^2 .

It is not a de Polignac number, because 398043805 - 2¹ = 398043803 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 (398043803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39804376 + ... + 39804385.

It is an arithmetic number, because the mean of its divisors is an integer number (119413143).

Almost surely, 2^398043805 is an apocalyptic number.

It is an amenable number.

398043805 is a deficient number, since it is larger than the sum of its proper divisors (79608767).

398043805 is an equidigital number, since it uses as much as digits as its factorization.

398043805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79608766.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 398043805 is about 19951.0351861752. The cubic root of 398043805 is about 735.6032223803.

The spelling of 398043805 in words is "three hundred ninety-eight million, forty-three thousand, eight hundred five".