891979 has 8 divisors (see below), whose sum is σ = 982080. Its totient is φ = 803400.

The previous prime is 891967. The next prime is 891983. The reversal of 891979 is 979198.

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 891979 - 2⁷ = 891851 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 1132 + ... + 1750.

It is an arithmetic number, because the mean of its divisors is an integer number (122760).

2⁸⁹¹⁹⁷⁹ is an apocalyptic number.

891979 is a deficient number, since it is larger than the sum of its proper divisors (90101).

891979 is a wasteful number, since it uses less digits than its factorization.

891979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761.

The product of its digits is 40824, while the sum is 43.

The square root of 891979 is about 944.4463986908. The cubic root of 891979 is about 96.2612602782.

It can be divided in two parts, 8919 and 79, that added together give a palindrome (8998).

The spelling of 891979 in words is "eight hundred ninety-one thousand, nine hundred seventy-nine".