86843821 has 2 divisors, whose sum is σ = 86843822. Its totient is φ = 86843820.

The previous prime is 86843759. The next prime is 86843833. The reversal of 86843821 is 12834868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84897796 + 1946025 = 9214^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 86843821 - 2¹¹ = 86841773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86843881) 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, 43421910 + 43421911.

It is an arithmetic number, because the mean of its divisors is an integer number (43421911).

Almost surely, 2^86843821 is an apocalyptic number.

It is an amenable number.

86843821 is a deficient number, since it is larger than the sum of its proper divisors (1).

86843821 is an equidigital number, since it uses as much as digits as its factorization.

86843821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 40.

The square root of 86843821 is about 9319.0032192290. The cubic root of 86843821 is about 442.8394552323.

The spelling of 86843821 in words is "eighty-six million, eight hundred forty-three thousand, eight hundred twenty-one".