91838 has 8 divisors (see below), whose sum is σ = 140832. Its totient is φ = 44896.

The previous prime is 91837. The next prime is 91841. The reversal of 91838 is 83819.

It is a happy number.

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

It is a plaindrome in base 14 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 91838.

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 91838.

It is not an unprimeable number, because it can be changed into a prime (91837) 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 3 ways as a sum of consecutive naturals, for example, 395 + ... + 582.

It is an arithmetic number, because the mean of its divisors is an integer number (17604).

2⁹¹⁸³⁸ is an apocalyptic number.

91838 is a deficient number, since it is larger than the sum of its proper divisors (48994).

91838 is a wasteful number, since it uses less digits than its factorization.

91838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026.

The product of its digits is 1728, while the sum is 29.

The square root of 91838 is about 303.0478510071. The cubic root of 91838 is about 45.1170614714.

Subtracting from 91838 its sum of digits (29), we obtain a square (91809 = 303²).

It can be divided in two parts, 91 and 838, that added together give a palindrome (929).

The spelling of 91838 in words is "ninety-one thousand, eight hundred thirty-eight".