228187 has 4 divisors (see below), whose sum is σ = 229680. Its totient is φ = 226696.

The previous prime is 228181. The next prime is 228197. The reversal of 228187 is 781822.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487 + ... + 832.

It is an arithmetic number, because the mean of its divisors is an integer number (57420).

2²²⁸¹⁸⁷ is an apocalyptic number.

228187 is a deficient number, since it is larger than the sum of its proper divisors (1493).

228187 is a wasteful number, since it uses less digits than its factorization.

228187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492.

The product of its digits is 1792, while the sum is 28.

The square root of 228187 is about 477.6892295206. The cubic root of 228187 is about 61.1078446984.

The spelling of 228187 in words is "two hundred twenty-eight thousand, one hundred eighty-seven".