40188 has 24 divisors (see below), whose sum is σ = 99792. Its totient is φ = 12544.

The previous prime is 40177. The next prime is 40189. The reversal of 40188 is 88104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40189) by changing a digit.

40188 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106 + ... + 302.

It is an arithmetic number, because the mean of its divisors is an integer number (4158).

2⁴⁰¹⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49896).

40188 is an abundant number, since it is smaller than the sum of its proper divisors (59604).

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

40188 is a wasteful number, since it uses less digits than its factorization.

40188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 40188 is about 200.4694490440. The cubic root of 40188 is about 34.2530144575.

The spelling of 40188 in words is "forty thousand, one hundred eighty-eight".