18843881 has 24 divisors (see below), whose sum is σ = 23085000. Its totient is φ = 15316224.

The previous prime is 18843859. The next prime is 18843893. The reversal of 18843881 is 18834881.

It can be written as a sum of positive squares in 4 ways, for example, as 8281 + 18835600 = 91^2 + 4340^2 .

It is not a de Polignac number, because 18843881 - 2¹⁸ = 18581737 is a prime.

It is a super-2 number, since 2×18843881² = 710183702284322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18843821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126395 + ... + 126543.

It is an arithmetic number, because the mean of its divisors is an integer number (961875).

Almost surely, 2^18843881 is an apocalyptic number.

It is an amenable number.

18843881 is a deficient number, since it is larger than the sum of its proper divisors (4241119).

18843881 is a wasteful number, since it uses less digits than its factorization.

18843881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 274 counting only the distinct ones).

The product of its digits is 49152, while the sum is 41.

The square root of 18843881 is about 4340.9539274219. The cubic root of 18843881 is about 266.1072974334.

The spelling of 18843881 in words is "eighteen million, eight hundred forty-three thousand, eight hundred eighty-one".