111806 has 4 divisors (see below), whose sum is σ = 167712. Its totient is φ = 55902.

The previous prime is 111799. The next prime is 111821. The reversal of 111806 is 608111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

111806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27950 + ... + 27953.

It is an arithmetic number, because the mean of its divisors is an integer number (41928).

2¹¹¹⁸⁰⁶ is an apocalyptic number.

111806 is a deficient number, since it is larger than the sum of its proper divisors (55906).

111806 is an equidigital number, since it uses as much as digits as its factorization.

111806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55905.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 111806 is about 334.3740420547. The cubic root of 111806 is about 48.1749977940.

Adding to 111806 its reverse (608111), we get a palindrome (719917).

The spelling of 111806 in words is "one hundred eleven thousand, eight hundred six".