111540 has 72 divisors (see below), whose sum is σ = 368928. Its totient is φ = 24960.

The previous prime is 111539. The next prime is 111577. The reversal of 111540 is 45111.

111540 = T₂₃ + T₂₄ + ... + T₈₇.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8574 + ... + 8586.

It is an arithmetic number, because the mean of its divisors is an integer number (5124).

2¹¹¹⁵⁴⁰ is an apocalyptic number.

111540 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 111540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184464).

111540 is an abundant number, since it is smaller than the sum of its proper divisors (257388).

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

111540 is a wasteful number, since it uses less digits than its factorization.

111540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 111540 is about 333.9760470453. The cubic root of 111540 is about 48.1367627400.

Adding to 111540 its reverse (45111), we get a palindrome (156651).

It can be divided in two parts, 11 and 1540, that added together give a palindrome (1551).

The spelling of 111540 in words is "one hundred eleven thousand, five hundred forty".