891238 has 4 divisors (see below), whose sum is σ = 1336860. Its totient is φ = 445618.

The previous prime is 891223. The next prime is 891239. The reversal of 891238 is 832198.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891239) 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 as a sum of consecutive naturals, namely, 222808 + ... + 222811.

It is an arithmetic number, because the mean of its divisors is an integer number (334215).

2⁸⁹¹²³⁸ is an apocalyptic number.

891238 is a deficient number, since it is larger than the sum of its proper divisors (445622).

891238 is a wasteful number, since it uses less digits than its factorization.

891238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445621.

The product of its digits is 3456, while the sum is 31.

The square root of 891238 is about 944.0540238779. The cubic root of 891238 is about 96.2345969617.

The spelling of 891238 in words is "eight hundred ninety-one thousand, two hundred thirty-eight".