18881856 has 168 divisors, whose sum is σ = 64861440. Its totient is φ = 5370624.

The previous prime is 18881809. The next prime is 18881861. The reversal of 18881856 is 65818881.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (168).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84561 + ... + 84783.

It is an arithmetic number, because the mean of its divisors is an integer number (386080).

Almost surely, 2^18881856 is an apocalyptic number.

18881856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18881856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32430720).

18881856 is an abundant number, since it is smaller than the sum of its proper divisors (45979584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18881856 is a wasteful number, since it uses less digits than its factorization.

18881856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 235 counting only the distinct ones).

The product of its digits is 122880, while the sum is 45.

The square root of 18881856 is about 4345.3257645429. The cubic root of 18881856 is about 266.2859344476.

The spelling of 18881856 in words is "eighteen million, eight hundred eighty-one thousand, eight hundred fifty-six".