398843393 has 4 divisors (see below), whose sum is σ = 429523668. Its totient is φ = 368163120.

The previous prime is 398843371. The next prime is 398843399. The reversal of 398843393 is 393348893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 243890689 + 154952704 = 15617^2 + 12448^2 .

It is not a de Polignac number, because 398843393 - 2²² = 394649089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398843399) 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, 15340118 + ... + 15340143.

It is an arithmetic number, because the mean of its divisors is an integer number (107380917).

Almost surely, 2^398843393 is an apocalyptic number.

It is an amenable number.

398843393 is a deficient number, since it is larger than the sum of its proper divisors (30680275).

398843393 is a wasteful number, since it uses less digits than its factorization.

398843393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30680274.

The product of its digits is 1679616, while the sum is 50.

The square root of 398843393 is about 19971.0638925421. The cubic root of 398843393 is about 736.0954513738.

The spelling of 398843393 in words is "three hundred ninety-eight million, eight hundred forty-three thousand, three hundred ninety-three".