398818393 has 8 divisors (see below), whose sum is σ = 400464000. Its totient is φ = 397177248.

The previous prime is 398818391. The next prime is 398818447. The reversal of 398818393 is 393818893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398818393 - 2¹ = 398818391 is a prime.

It is a super-3 number, since 3×398818393³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398818393.

It is not an unprimeable number, because it can be changed into a prime (398818391) 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 7 ways as a sum of consecutive naturals, for example, 484180 + ... + 485002.

It is an arithmetic number, because the mean of its divisors is an integer number (50058000).

Almost surely, 2^398818393 is an apocalyptic number.

It is an amenable number.

398818393 is a deficient number, since it is larger than the sum of its proper divisors (1645607).

398818393 is an equidigital number, since it uses as much as digits as its factorization.

398818393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231.

The product of its digits is 1119744, while the sum is 52.

The square root of 398818393 is about 19970.4379771702. The cubic root of 398818393 is about 736.0800712596.

The spelling of 398818393 in words is "three hundred ninety-eight million, eight hundred eighteen thousand, three hundred ninety-three".