18871488 has 112 divisors (see below), whose sum is σ = 56652160. Its totient is φ = 6158592.

The previous prime is 18871481. The next prime is 18871499. The reversal of 18871488 is 88417881.

It is a super-2 number, since 2×18871488² = 712266118668288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18871481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115695 + ... + 115857.

Almost surely, 2^18871488 is an apocalyptic number.

18871488 is a gapful number since it is divisible by the number (18) 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 18871488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28326080).

18871488 is an abundant number, since it is smaller than the sum of its proper divisors (37780672).

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

18871488 is a wasteful number, since it uses less digits than its factorization.

18871488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 235 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 18871488 is about 4344.1325946614. The cubic root of 18871488 is about 266.2371864494.

It can be divided in two parts, 1887 and 1488, that added together give a cube (3375 = 15³).

The spelling of 18871488 in words is "eighteen million, eight hundred seventy-one thousand, four hundred eighty-eight".