8490681 has 6 divisors (see below), whose sum is σ = 12264330. Its totient is φ = 5660448.

The previous prime is 8490673. The next prime is 8490721. The reversal of 8490681 is 1860948.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5546025 + 2944656 = 2355^2 + 1716^2 .

It is not a de Polignac number, because 8490681 - 2³ = 8490673 is a prime.

It is a super-2 number, since 2×8490681² = 144183327687522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8490661) 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 in 5 ways as a sum of consecutive naturals, for example, 471696 + ... + 471713.

It is an arithmetic number, because the mean of its divisors is an integer number (2044055).

Almost surely, 2^8490681 is an apocalyptic number.

It is an amenable number.

8490681 is a deficient number, since it is larger than the sum of its proper divisors (3773649).

8490681 is a wasteful number, since it uses less digits than its factorization.

8490681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943415 (or 943412 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 8490681 is about 2913.8773138209. The cubic root of 8490681 is about 204.0081455802.

The spelling of 8490681 in words is "eight million, four hundred ninety thousand, six hundred eighty-one".