91398 has 8 divisors (see below), whose sum is σ = 182808. Its totient is φ = 30464.

The previous prime is 91397. The next prime is 91411. The reversal of 91398 is 89319.

It is a happy number.

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

91398 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91398.

It is not an unprimeable number, because it can be changed into a prime (91393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7611 + ... + 7622.

It is an arithmetic number, because the mean of its divisors is an integer number (22851).

2⁹¹³⁹⁸ is an apocalyptic number.

91398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91404).

91398 is a wasteful number, since it uses less digits than its factorization.

91398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15238.

The product of its digits is 1944, while the sum is 30.

The square root of 91398 is about 302.3210214325. The cubic root of 91398 is about 45.0448934695.

The spelling of 91398 in words is "ninety-one thousand, three hundred ninety-eight".