438891 has 4 divisors (see below), whose sum is σ = 585192. Its totient is φ = 292592.

The previous prime is 438887. The next prime is 438899. The reversal of 438891 is 198834.

438891 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 438891 - 2² = 438887 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (438899) 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, 73146 + ... + 73151.

It is an arithmetic number, because the mean of its divisors is an integer number (146298).

2⁴³⁸⁸⁹¹ is an apocalyptic number.

438891 is a deficient number, since it is larger than the sum of its proper divisors (146301).

438891 is a wasteful number, since it uses less digits than its factorization.

438891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146300.

The product of its digits is 6912, while the sum is 33.

The square root of 438891 is about 662.4884904661. The cubic root of 438891 is about 75.9950943279.

The spelling of 438891 in words is "four hundred thirty-eight thousand, eight hundred ninety-one".