806398889 has 4 divisors (see below), whose sum is σ = 806499924. Its totient is φ = 806297856.

The previous prime is 806398793. The next prime is 806398891. The reversal of 806398889 is 988893608.

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

It can be written as a sum of positive squares in 2 ways, for example, as 170955625 + 635443264 = 13075^2 + 25208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806398889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806398289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37412 + ... + 54885.

It is an arithmetic number, because the mean of its divisors is an integer number (201624981).

Almost surely, 2^806398889 is an apocalyptic number.

It is an amenable number.

806398889 is a deficient number, since it is larger than the sum of its proper divisors (101035).

806398889 is an equidigital number, since it uses as much as digits as its factorization.

806398889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101034.

The product of its (nonzero) digits is 5971968, while the sum is 59.

The square root of 806398889 is about 28397.1633970719. The cubic root of 806398889 is about 930.7862811230.

The spelling of 806398889 in words is "eight hundred six million, three hundred ninety-eight thousand, eight hundred eighty-nine".