8427681 has 12 divisors (see below), whose sum is σ = 12199252. Its totient is φ = 5606496.

The previous prime is 8427667. The next prime is 8427701. The reversal of 8427681 is 1867248.

It can be written as a sum of positive squares in 2 ways, for example, as 5803281 + 2624400 = 2409^2 + 1620^2 .

It is not a de Polignac number, because 8427681 - 2¹⁴ = 8411297 is a prime.

It is a super-2 number, since 2×8427681² = 142051614075522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8427481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6195 + ... + 7431.

Almost surely, 2^8427681 is an apocalyptic number.

It is an amenable number.

8427681 is a deficient number, since it is larger than the sum of its proper divisors (3771571).

8427681 is a wasteful number, since it uses less digits than its factorization.

8427681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000 (or 1997 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 8427681 is about 2903.0468477102. The cubic root of 8427681 is about 203.5023191344.

The spelling of 8427681 in words is "eight million, four hundred twenty-seven thousand, six hundred eighty-one".