188 has 6 divisors (see below), whose sum is σ = 336. Its totient is φ = 92.

The previous prime is 181. The next prime is 191. The reversal of 188 is 881.

Subtracting from 188 its sum of digits (17), we obtain a palindrome (171).

Adding to 188 its product of digits (64), we get a palindrome (252).

It can be divided in two parts, 18 and 8, that multiplied together give a square (144 = 12^{2}).

It is a happy number.

188 is nontrivially palindromic in base 11.

188 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

188 is an undulating number in base 11.

It is a plaindrome in base 5, base 7, base 9, base 10, base 12, base 13 and base 16.

It is a nialpdrome in base 14 and base 15.

It is a congruent number.

188 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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20 + ... + 27.

It is an arithmetic number, because the mean of its divisors is an integer number (56).

It is an amenable number.

188 is a deficient number, since it is larger than the sum of its proper divisors (148).

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

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

The sum of its prime factors is 51 (or 49 counting only the distinct ones).

The product of its digits is 64, while the sum is 17.

The square root of 188 is about 13.7113092008. The cubic root of 188 is about 5.7286543160.

The spelling of 188 in words is "one hundred eighty-eight", and thus it is an aban number.

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