891742 has 4 divisors (see below), whose sum is σ = 1337616. Its totient is φ = 445870.

The previous prime is 891707. The next prime is 891743. The reversal of 891742 is 247198.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (891743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222934 + ... + 222937.

It is an arithmetic number, because the mean of its divisors is an integer number (334404).

2⁸⁹¹⁷⁴² is an apocalyptic number.

891742 is a deficient number, since it is larger than the sum of its proper divisors (445874).

891742 is a wasteful number, since it uses less digits than its factorization.

891742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445873.

The product of its digits is 4032, while the sum is 31.

The square root of 891742 is about 944.3209200267. The cubic root of 891742 is about 96.2527339416.

The spelling of 891742 in words is "eight hundred ninety-one thousand, seven hundred forty-two".