166388 has 6 divisors (see below), whose sum is σ = 291186. Its totient is φ = 83192.

The previous prime is 166363. The next prime is 166393. The reversal of 166388 is 883661.

166388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 131044 + 35344 = 362^2 + 188^2 .

It is a plaindrome in base 14 and base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166388.

It is an unprimeable number.

166388 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 as a sum of consecutive naturals, namely, 20795 + ... + 20802.

It is an arithmetic number, because the mean of its divisors is an integer number (48531).

2¹⁶⁶³⁸⁸ is an apocalyptic number.

It is an amenable number.

166388 is a deficient number, since it is larger than the sum of its proper divisors (124798).

166388 is a wasteful number, since it uses less digits than its factorization.

166388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41601 (or 41599 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 166388 is about 407.9068521121. The cubic root of 166388 is about 55.0014324696.

The spelling of 166388 in words is "one hundred sixty-six thousand, three hundred eighty-eight".