188406 has 20 divisors (see below), whose sum is σ = 422532. Its totient is φ = 62748.

The previous prime is 188401. The next prime is 188407. The reversal of 188406 is 604881.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 13.

It is a zygodrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 188406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188401) by changing a digit.

188406 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 9 ways as a sum of consecutive naturals, for example, 420 + ... + 743.

2¹⁸⁸⁴⁰⁶ is an apocalyptic number.

188406 is an abundant number, since it is smaller than the sum of its proper divisors (234126).

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

188406 is a wasteful number, since it uses less digits than its factorization.

188406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 188406 is about 434.0575998643. The cubic root of 188406 is about 57.3277516951.

The spelling of 188406 in words is "one hundred eighty-eight thousand, four hundred six".