18781120 has 56 divisors (see below), whose sum is σ = 47091600. Its totient is φ = 7114752.

The previous prime is 18781109. The next prime is 18781121. The reversal of 18781120 is 2118781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18781121) 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, 4536 + ... + 7624.

Almost surely, 2^18781120 is an apocalyptic number.

18781120 is a gapful number since it is divisible by the number (10) 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 18781120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23545800).

18781120 is an abundant number, since it is smaller than the sum of its proper divisors (28310480).

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

18781120 is a wasteful number, since it uses less digits than its factorization.

18781120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125 (or 3115 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 18781120 is about 4333.7189572006. The cubic root of 18781120 is about 265.8115385435.

The spelling of 18781120 in words is "eighteen million, seven hundred eighty-one thousand, one hundred twenty".