806389999 has 2 divisors, whose sum is σ = 806390000. Its totient is φ = 806389998.

The previous prime is 806389943. The next prime is 806390017. The reversal of 806389999 is 999983608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 806389999 - 2⁹ = 806389487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806389699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403194999 + 403195000.

It is an arithmetic number, because the mean of its divisors is an integer number (403195000).

Almost surely, 2^806389999 is an apocalyptic number.

806389999 is a deficient number, since it is larger than the sum of its proper divisors (1).

806389999 is an equidigital number, since it uses as much as digits as its factorization.

806389999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7558272, while the sum is 61.

The square root of 806389999 is about 28397.0068669217. The cubic root of 806389999 is about 930.7828606816.

The spelling of 806389999 in words is "eight hundred six million, three hundred eighty-nine thousand, nine hundred ninety-nine".