891939 has 8 divisors (see below), whose sum is σ = 1259280. Its totient is φ = 559616.

The previous prime is 891929. The next prime is 891967. The reversal of 891939 is 939198.

891939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 891939 - 2⁴ = 891923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 891897 and 891906.

It is not an unprimeable number, because it can be changed into a prime (891929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8694 + ... + 8795.

It is an arithmetic number, because the mean of its divisors is an integer number (157410).

2⁸⁹¹⁹³⁹ is an apocalyptic number.

891939 is a deficient number, since it is larger than the sum of its proper divisors (367341).

891939 is a wasteful number, since it uses less digits than its factorization.

891939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17509.

The product of its digits is 17496, while the sum is 39.

The square root of 891939 is about 944.4252220266. The cubic root of 891939 is about 96.2598213400.

It can be divided in two parts, 891 and 939, that added together give a triangular number (1830 = T₆₀).

The spelling of 891939 in words is "eight hundred ninety-one thousand, nine hundred thirty-nine".