845977979 has 16 divisors (see below), whose sum is σ = 1070474496. Its totient is φ = 649360800.

The previous prime is 845977961. The next prime is 845977991. The reversal of 845977979 is 979779548.

It is not a de Polignac number, because 845977979 - 2²⁴ = 829200763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (845977949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76832 + ... + 87149.

It is an arithmetic number, because the mean of its divisors is an integer number (66904656).

Almost surely, 2^845977979 is an apocalyptic number.

845977979 is a deficient number, since it is larger than the sum of its proper divisors (224496517).

845977979 is a wasteful number, since it uses less digits than its factorization.

845977979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164066.

The product of its digits is 40007520, while the sum is 65.

The square root of 845977979 is about 29085.7005932468. The cubic root of 845977979 is about 945.7717831247.

The spelling of 845977979 in words is "eight hundred forty-five million, nine hundred seventy-seven thousand, nine hundred seventy-nine".