191398 has 8 divisors (see below), whose sum is σ = 290808. Its totient is φ = 94464.

The previous prime is 191353. The next prime is 191413. The reversal of 191398 is 893191.

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

It is a congruent number.

It is an unprimeable number.

191398 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 411 + ... + 742.

It is an arithmetic number, because the mean of its divisors is an integer number (36351).

2¹⁹¹³⁹⁸ is an apocalyptic number.

191398 is a deficient number, since it is larger than the sum of its proper divisors (99410).

191398 is a wasteful number, since it uses less digits than its factorization.

191398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238.

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

The square root of 191398 is about 437.4905713270. The cubic root of 191398 is about 57.6296256421.

It can be divided in two parts, 19 and 1398, that multiplied together give a palindrome (26562).

The spelling of 191398 in words is "one hundred ninety-one thousand, three hundred ninety-eight".