845979 has 4 divisors (see below), whose sum is σ = 1127976. Its totient is φ = 563984.

The previous prime is 845969. The next prime is 845981. The reversal of 845979 is 979548.

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

It is a cyclic number.

It is not a de Polignac number, because 845979 - 2⁸ = 845723 is a prime.

It is a D-number.

845979 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 845979.

It is not an unprimeable number, because it can be changed into a prime (845909) 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, 140994 + ... + 140999.

It is an arithmetic number, because the mean of its divisors is an integer number (281994).

2⁸⁴⁵⁹⁷⁹ is an apocalyptic number.

845979 is a deficient number, since it is larger than the sum of its proper divisors (281997).

845979 is a wasteful number, since it uses less digits than its factorization.

845979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281996.

The product of its digits is 90720, while the sum is 42.

The square root of 845979 is about 919.7711671932. The cubic root of 845979 is about 94.5772163605.

The spelling of 845979 in words is "eight hundred forty-five thousand, nine hundred seventy-nine".