8646381 has 6 divisors (see below), whose sum is σ = 12489230. Its totient is φ = 5764248.

The previous prime is 8646377. The next prime is 8646389. The reversal of 8646381 is 1836468.

It is a happy number.

8646381 is a `hidden beast` number, since 8 + 646 + 3 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8608356 + 38025 = 2934^2 + 195^2 .

It is not a de Polignac number, because 8646381 - 2² = 8646377 is a prime.

It is a super-2 number, since 2×8646381² = 149519808794322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8646389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 480346 + ... + 480363.

Almost surely, 2^8646381 is an apocalyptic number.

It is an amenable number.

8646381 is a deficient number, since it is larger than the sum of its proper divisors (3842849).

8646381 is a wasteful number, since it uses less digits than its factorization.

8646381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960715 (or 960712 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 8646381 is about 2940.4729211472. The cubic root of 8646381 is about 205.2476167098.

The spelling of 8646381 in words is "eight million, six hundred forty-six thousand, three hundred eighty-one".