111123840 has 128 divisors (see below), whose sum is σ = 365829120. Its totient is φ = 28661760.

The previous prime is 111123797. The next prime is 111123847. The reversal of 111123840 is 48321111.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111123847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58587 + ... + 60453.

It is an arithmetic number, because the mean of its divisors is an integer number (2858040).

Almost surely, 2^111123840 is an apocalyptic number.

111123840 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 111123840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182914560).

111123840 is an abundant number, since it is smaller than the sum of its proper divisors (254705280).

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

111123840 is a wasteful number, since it uses less digits than its factorization.

111123840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 111123840 is about 10541.5293008178. The cubic root of 111123840 is about 480.7682143027.

Adding to 111123840 its reverse (48321111), we get a palindrome (159444951).

The spelling of 111123840 in words is "one hundred eleven million, one hundred twenty-three thousand, eight hundred forty".