91438 has 8 divisors (see below), whose sum is σ = 138600. Its totient is φ = 45240.

The previous prime is 91433. The next prime is 91453. The reversal of 91438 is 83419.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91433) by changing a digit.

91438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88 + ... + 436.

It is an arithmetic number, because the mean of its divisors is an integer number (17325).

2⁹¹⁴³⁸ is an apocalyptic number.

91438 is a deficient number, since it is larger than the sum of its proper divisors (47162).

91438 is a wasteful number, since it uses less digits than its factorization.

91438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482.

The product of its digits is 864, while the sum is 25.

The square root of 91438 is about 302.3871690400. The cubic root of 91438 is about 45.0514637554.

It can be divided in two parts, 91 and 438, that added together give a square (529 = 23²).

The spelling of 91438 in words is "ninety-one thousand, four hundred thirty-eight".