86643421 has 4 divisors (see below), whose sum is σ = 86703100. Its totient is φ = 86583744.

The previous prime is 86643397. The next prime is 86643437. The reversal of 86643421 is 12434668.

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 12924025 + 73719396 = 3595^2 + 8586^2 .

It is a cyclic number.

It is not a de Polignac number, because 86643421 - 2¹³ = 86635229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86641421) 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 in 3 ways as a sum of consecutive naturals, for example, 27606 + ... + 30583.

It is an arithmetic number, because the mean of its divisors is an integer number (21675775).

Almost surely, 2^86643421 is an apocalyptic number.

It is an amenable number.

86643421 is a deficient number, since it is larger than the sum of its proper divisors (59679).

86643421 is a wasteful number, since it uses less digits than its factorization.

86643421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59678.

The product of its digits is 27648, while the sum is 34.

The square root of 86643421 is about 9308.2447862097. The cubic root of 86643421 is about 442.4985621369.

The spelling of 86643421 in words is "eighty-six million, six hundred forty-three thousand, four hundred twenty-one".