85805389 has 2 divisors, whose sum is σ = 85805390. Its totient is φ = 85805388.

The previous prime is 85805383. The next prime is 85805449. The reversal of 85805389 is 98350858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58400164 + 27405225 = 7642^2 + 5235^2 .

It is a cyclic number.

It is not a de Polignac number, because 85805389 - 2⁹ = 85804877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85805383) 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 as a sum of consecutive naturals, namely, 42902694 + 42902695.

It is an arithmetic number, because the mean of its divisors is an integer number (42902695).

Almost surely, 2^85805389 is an apocalyptic number.

It is an amenable number.

85805389 is a deficient number, since it is larger than the sum of its proper divisors (1).

85805389 is an equidigital number, since it uses as much as digits as its factorization.

85805389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 85805389 is about 9263.1198308129. The cubic root of 85805389 is about 441.0672936492.

The spelling of 85805389 in words is "eighty-five million, eight hundred five thousand, three hundred eighty-nine".