18841005 has 32 divisors (see below), whose sum is σ = 33928320. Its totient is φ = 10042704.

The previous prime is 18840967. The next prime is 18841019. The reversal of 18841005 is 50014881.

It is not a de Polignac number, because 18841005 - 2¹⁰ = 18839981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18841005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10074 + ... + 11796.

It is an arithmetic number, because the mean of its divisors is an integer number (1060260).

Almost surely, 2^18841005 is an apocalyptic number.

18841005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18841005 is a deficient number, since it is larger than the sum of its proper divisors (15087315).

18841005 is an frugal number, since it uses more digits than its factorization.

18841005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18841005 is about 4340.6226511873. The cubic root of 18841005 is about 266.0937587587.

Adding to 18841005 its reverse (50014881), we get a palindrome (68855886).

The spelling of 18841005 in words is "eighteen million, eight hundred forty-one thousand, five".