18727872 has 56 divisors (see below), whose sum is σ = 50084736. Its totient is φ = 6175488.

The previous prime is 18727867. The next prime is 18727873. The reversal of 18727872 is 27872781.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18727873) 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, 19303 + ... + 20249.

Almost surely, 2^18727872 is an apocalyptic number.

18727872 is a gapful number since it is divisible by the number (12) 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 18727872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25042368).

18727872 is an abundant number, since it is smaller than the sum of its proper divisors (31356864).

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

18727872 is a wasteful number, since it uses less digits than its factorization.

18727872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1055 counting only the distinct ones).

The product of its digits is 87808, while the sum is 42.

The square root of 18727872 is about 4327.5711432627. The cubic root of 18727872 is about 265.5600922282.

The spelling of 18727872 in words is "eighteen million, seven hundred twenty-seven thousand, eight hundred seventy-two".