8181885 has 16 divisors (see below), whose sum is σ = 13161600. Its totient is φ = 4340160.

The previous prime is 8181881. The next prime is 8181889. The reversal of 8181885 is 5881818.

It is an interprime number because it is at equal distance from previous prime (8181881) and next prime (8181889).

It is not a de Polignac number, because 8181885 - 2² = 8181881 is a prime.

It is a Curzon number.

8181885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1615 + ... + 4355.

It is an arithmetic number, because the mean of its divisors is an integer number (822600).

Almost surely, 2^8181885 is an apocalyptic number.

It is an amenable number.

8181885 is a deficient number, since it is larger than the sum of its proper divisors (4979715).

8181885 is a wasteful number, since it uses less digits than its factorization.

8181885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948.

The product of its digits is 20480, while the sum is 39.

The square root of 8181885 is about 2860.3994476296. The cubic root of 8181885 is about 201.5043644009.

The spelling of 8181885 in words is "eight million, one hundred eighty-one thousand, eight hundred eighty-five".