891949 has 4 divisors (see below), whose sum is σ = 912736. Its totient is φ = 871164.

The previous prime is 891929. The next prime is 891967. The reversal of 891949 is 949198.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 891949 - 2¹¹ = 889901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891929) 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, 10329 + ... + 10414.

It is an arithmetic number, because the mean of its divisors is an integer number (228184).

2⁸⁹¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

891949 is a deficient number, since it is larger than the sum of its proper divisors (20787).

891949 is a wasteful number, since it uses less digits than its factorization.

891949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20786.

The product of its digits is 23328, while the sum is 40.

The square root of 891949 is about 944.4305162372. The cubic root of 891949 is about 96.2601810785.

The spelling of 891949 in words is "eight hundred ninety-one thousand, nine hundred forty-nine".