166387 has 4 divisors (see below), whose sum is σ = 179200. Its totient is φ = 153576.

The previous prime is 166363. The next prime is 166393. The reversal of 166387 is 783661.

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

It is a cyclic number.

It is not a de Polignac number, because 166387 - 2⁷ = 166259 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (166357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6387 + ... + 6412.

It is an arithmetic number, because the mean of its divisors is an integer number (44800).

166387 is a Friedman number, since it can be written as 6+6+(8*7-1)^3, using all its digits and the basic arithmetic operations.

2¹⁶⁶³⁸⁷ is an apocalyptic number.

166387 is a deficient number, since it is larger than the sum of its proper divisors (12813).

166387 is a wasteful number, since it uses less digits than its factorization.

166387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12812.

The product of its digits is 6048, while the sum is 31.

The square root of 166387 is about 407.9056263402. The cubic root of 166387 is about 55.0013222823.

The spelling of 166387 in words is "one hundred sixty-six thousand, three hundred eighty-seven".