8386921 has 2 divisors, whose sum is σ = 8386922. Its totient is φ = 8386920.

The previous prime is 8386913. The next prime is 8386943. The reversal of 8386921 is 1296838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7778521 + 608400 = 2789^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 8386921 - 2³ = 8386913 is a prime.

8386921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8380921) 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, 4193460 + 4193461.

It is an arithmetic number, because the mean of its divisors is an integer number (4193461).

Almost surely, 2^8386921 is an apocalyptic number.

It is an amenable number.

8386921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8386921 is an equidigital number, since it uses as much as digits as its factorization.

8386921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 8386921 is about 2896.0181283963. The cubic root of 8386921 is about 203.1737130032.

The spelling of 8386921 in words is "eight million, three hundred eighty-six thousand, nine hundred twenty-one".