86847421 has 2 divisors, whose sum is σ = 86847422. Its totient is φ = 86847420.

The previous prime is 86847403. The next prime is 86847427. The reversal of 86847421 is 12474868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 27941796 = 7675^2 + 5286^2 .

It is a cyclic number.

It is not a de Polignac number, because 86847421 - 2¹³ = 86839229 is a prime.

It is a super-3 number, since 3×86847421³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86847427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43423710 + 43423711.

It is an arithmetic number, because the mean of its divisors is an integer number (43423711).

Almost surely, 2^86847421 is an apocalyptic number.

It is an amenable number.

86847421 is a deficient number, since it is larger than the sum of its proper divisors (1).

86847421 is an equidigital number, since it uses as much as digits as its factorization.

86847421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 40.

The square root of 86847421 is about 9319.1963709324. The cubic root of 86847421 is about 442.8455742630.

The spelling of 86847421 in words is "eighty-six million, eight hundred forty-seven thousand, four hundred twenty-one".