18103881 has 8 divisors (see below), whose sum is σ = 24274080. Its totient is φ = 12001472.

The previous prime is 18103879. The next prime is 18103909. The reversal of 18103881 is 18830181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18103881 - 2¹ = 18103879 is a prime.

It is a super-2 number, since 2×18103881² = 655501014524322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18103831) 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 7 ways as a sum of consecutive naturals, for example, 16320 + ... + 17393.

It is an arithmetic number, because the mean of its divisors is an integer number (3034260).

Almost surely, 2^18103881 is an apocalyptic number.

It is an amenable number.

18103881 is a deficient number, since it is larger than the sum of its proper divisors (6170199).

18103881 is a wasteful number, since it uses less digits than its factorization.

18103881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33895.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 18103881 is about 4254.8655677941. The cubic root of 18103881 is about 262.5773305048.

The spelling of 18103881 in words is "eighteen million, one hundred three thousand, eight hundred eighty-one".