111870 has 48 divisors (see below), whose sum is σ = 320112. Its totient is φ = 26880.

The previous prime is 111869. The next prime is 111871. The reversal of 111870 is 78111.

It is an interprime number because it is at equal distance from previous prime (111869) and next prime (111871).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 934 + ... + 1046.

It is an arithmetic number, because the mean of its divisors is an integer number (6669).

2¹¹¹⁸⁷⁰ is an apocalyptic number.

111870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160056).

111870 is an abundant number, since it is smaller than the sum of its proper divisors (208242).

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

111870 is a wasteful number, since it uses less digits than its factorization.

111870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The square root of 111870 is about 334.4697295720. The cubic root of 111870 is about 48.1841881527.

Adding to 111870 its reverse (78111), we get a palindrome (189981).

It can be divided in two parts, 11 and 1870, that added together give a palindrome (1881).

The spelling of 111870 in words is "one hundred eleven thousand, eight hundred seventy".