8209881 has 24 divisors (see below), whose sum is σ = 12798240. Its totient is φ = 5054400.

The previous prime is 8209867. The next prime is 8209891. The reversal of 8209881 is 1889028.

It is not a de Polignac number, because 8209881 - 2⁵ = 8209849 is a prime.

It is a super-2 number, since 2×8209881² = 134804292068322, which contains 22 as substring.

8209881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8209841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6426 + ... + 7596.

It is an arithmetic number, because the mean of its divisors is an integer number (533260).

Almost surely, 2^8209881 is an apocalyptic number.

It is an amenable number.

8209881 is a deficient number, since it is larger than the sum of its proper divisors (4588359).

8209881 is a wasteful number, since it uses less digits than its factorization.

8209881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 8209881 is about 2865.2889906605. The cubic root of 8209881 is about 201.7339322850.

It can be divided in two parts, 820 and 9881, that added together give a palindrome (10701).

The spelling of 8209881 in words is "eight million, two hundred nine thousand, eight hundred eighty-one".