18871112 has 32 divisors (see below), whose sum is σ = 39425400. Its totient is φ = 8408064.

The previous prime is 18871103. The next prime is 18871121. The reversal of 18871112 is 21117881.

It is an interprime number because it is at equal distance from previous prime (18871103) and next prime (18871121).

It can be written as a sum of positive squares in 4 ways, for example, as 17859076 + 1012036 = 4226^2 + 1006^2 .

It is a super-2 number, since 2×18871112² = 712237736233088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113 + ... + 6144.

Almost surely, 2^18871112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18871112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19712700).

18871112 is an abundant number, since it is smaller than the sum of its proper divisors (20554288).

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

18871112 is a wasteful number, since it uses less digits than its factorization.

18871112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305 (or 6301 counting only the distinct ones).

The product of its digits is 896, while the sum is 29.

The square root of 18871112 is about 4344.0893176821. The cubic root of 18871112 is about 266.2354182467.

Adding to 18871112 its reverse (21117881), we get a palindrome (39988993).

The spelling of 18871112 in words is "eighteen million, eight hundred seventy-one thousand, one hundred twelve".