891438 has 8 divisors (see below), whose sum is σ = 1782888. Its totient is φ = 297144.

The previous prime is 891427. The next prime is 891439. The reversal of 891438 is 834198.

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

891438 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 891399 and 891408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891439) 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, 74281 + ... + 74292.

It is an arithmetic number, because the mean of its divisors is an integer number (222861).

2⁸⁹¹⁴³⁸ is an apocalyptic number.

891438 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.

891438 is a wasteful number, since it uses less digits than its factorization.

891438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148578.

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

The square root of 891438 is about 944.1599440773. The cubic root of 891438 is about 96.2417949941.

The spelling of 891438 in words is "eight hundred ninety-one thousand, four hundred thirty-eight".