86639843 has 2 divisors, whose sum is σ = 86639844. Its totient is φ = 86639842.

The previous prime is 86639821. The next prime is 86639851. The reversal of 86639843 is 34893668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86639843 - 2¹⁰ = 86638819 is a prime.

It is not a weakly prime, because it can be changed into another prime (86639893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43319921 + 43319922.

It is an arithmetic number, because the mean of its divisors is an integer number (43319922).

Almost surely, 2^86639843 is an apocalyptic number.

86639843 is a deficient number, since it is larger than the sum of its proper divisors (1).

86639843 is an equidigital number, since it uses as much as digits as its factorization.

86639843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 47.

The square root of 86639843 is about 9308.0525890220. The cubic root of 86639843 is about 442.4924709583.

The spelling of 86639843 in words is "eighty-six million, six hundred thirty-nine thousand, eight hundred forty-three".