398191 has 8 divisors (see below), whose sum is σ = 429840. Its totient is φ = 367488.

The previous prime is 398171. The next prime is 398207. The reversal of 398191 is 191893.

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 398191 - 2⁷ = 398063 is a prime.

It is a Duffinian number.

398191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805 + ... + 1201.

It is an arithmetic number, because the mean of its divisors is an integer number (53730).

2³⁹⁸¹⁹¹ is an apocalyptic number.

398191 is a deficient number, since it is larger than the sum of its proper divisors (31649).

398191 is a wasteful number, since it uses less digits than its factorization.

398191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473.

The product of its digits is 1944, while the sum is 31.

The square root of 398191 is about 631.0237713430. The cubic root of 398191 is about 73.5693885578.

The spelling of 398191 in words is "three hundred ninety-eight thousand, one hundred ninety-one".