398193361 has 4 divisors (see below), whose sum is σ = 398305332. Its totient is φ = 398081392.

The previous prime is 398193349. The next prime is 398193379. The reversal of 398193361 is 163391893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163391893 = 7 ⋅23341699.

It can be written as a sum of positive squares in 2 ways, for example, as 124456336 + 273737025 = 11156^2 + 16545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398193361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398193391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50470 + ... + 57823.

It is an arithmetic number, because the mean of its divisors is an integer number (99576333).

Almost surely, 2^398193361 is an apocalyptic number.

It is an amenable number.

398193361 is a deficient number, since it is larger than the sum of its proper divisors (111971).

398193361 is a wasteful number, since it uses less digits than its factorization.

398193361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111970.

The product of its digits is 104976, while the sum is 43.

The square root of 398193361 is about 19954.7829103701. The cubic root of 398193361 is about 735.6953396285.

The spelling of 398193361 in words is "three hundred ninety-eight million, one hundred ninety-three thousand, three hundred sixty-one".