111640 has 16 divisors (see below), whose sum is σ = 251280. Its totient is φ = 44640.

The previous prime is 111637. The next prime is 111641. The reversal of 111640 is 46111.

It is a self number, because there is not a number n which added to its sum of digits gives 111640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1356 + ... + 1435.

It is an arithmetic number, because the mean of its divisors is an integer number (15705).

2¹¹¹⁶⁴⁰ is an apocalyptic number.

111640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111640 is an abundant number, since it is smaller than the sum of its proper divisors (139640).

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

111640 is a wasteful number, since it uses less digits than its factorization.

111640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802 (or 2798 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 111640 is about 334.1257248402. The cubic root of 111640 is about 48.1511439439.

Adding to 111640 its reverse (46111), we get a palindrome (157751).

It can be divided in two parts, 1116 and 40, that added together give a square (1156 = 34²).

The spelling of 111640 in words is "one hundred eleven thousand, six hundred forty".