806543989 has 4 divisors (see below), whose sum is σ = 807238656. Its totient is φ = 805849324.

The previous prime is 806543987. The next prime is 806544023. The reversal of 806543989 is 989345608.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 806543989 - 2¹ = 806543987 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 (806543987) 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 3 ways as a sum of consecutive naturals, for example, 345589 + ... + 347914.

It is an arithmetic number, because the mean of its divisors is an integer number (201809664).

Almost surely, 2^806543989 is an apocalyptic number.

It is an amenable number.

806543989 is a deficient number, since it is larger than the sum of its proper divisors (694667).

806543989 is a wasteful number, since it uses less digits than its factorization.

806543989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694666.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 806543989 is about 28399.7181147983. The cubic root of 806543989 is about 930.8421050217.

The spelling of 806543989 in words is "eight hundred six million, five hundred forty-three thousand, nine hundred eighty-nine".