845947989 has 8 divisors (see below), whose sum is σ = 1253256320. Its totient is φ = 563965308.

The previous prime is 845947979. The next prime is 845947997. The reversal of 845947989 is 989749548.

845947989 is a `hidden beast` number, since 84 + 5 + 9 + 479 + 89 = 666.

It is not a de Polignac number, because 845947989 - 2¹⁹ = 845423701 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 (845947919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15665677 + ... + 15665730.

It is an arithmetic number, because the mean of its divisors is an integer number (156657040).

Almost surely, 2^845947989 is an apocalyptic number.

It is an amenable number.

845947989 is a deficient number, since it is larger than the sum of its proper divisors (407308331).

845947989 is a wasteful number, since it uses less digits than its factorization.

845947989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31331416 (or 31331410 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The square root of 845947989 is about 29085.1850432484. The cubic root of 845947989 is about 945.7606070927.

The spelling of 845947989 in words is "eight hundred forty-five million, nine hundred forty-seven thousand, nine hundred eighty-nine".