8639881 has 4 divisors (see below), whose sum is σ = 9015552. Its totient is φ = 8264212.

The previous prime is 8639863. The next prime is 8639899. The reversal of 8639881 is 1889368.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8639863) and next prime (8639899).

It is a cyclic number.

It is not a de Polignac number, because 8639881 - 2⁵ = 8639849 is a prime.

It is a super-2 number, since 2×8639881² = 149295087388322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8639381) 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 3 ways as a sum of consecutive naturals, for example, 187801 + ... + 187846.

It is an arithmetic number, because the mean of its divisors is an integer number (2253888).

Almost surely, 2^8639881 is an apocalyptic number.

It is an amenable number.

8639881 is a deficient number, since it is larger than the sum of its proper divisors (375671).

8639881 is a wasteful number, since it uses less digits than its factorization.

8639881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375670.

The product of its digits is 82944, while the sum is 43.

The square root of 8639881 is about 2939.3674489590. The cubic root of 8639881 is about 205.1961715268.

The spelling of 8639881 in words is "eight million, six hundred thirty-nine thousand, eight hundred eighty-one".