228686 has 4 divisors (see below), whose sum is σ = 343032. Its totient is φ = 114342.

The previous prime is 228677. The next prime is 228707. The reversal of 228686 is 686822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 686822 = 2 ⋅343411.

It is a congruent number.

It is an unprimeable number.

228686 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, 57170 + ... + 57173.

It is an arithmetic number, because the mean of its divisors is an integer number (85758).

2²²⁸⁶⁸⁶ is an apocalyptic number.

228686 is a deficient number, since it is larger than the sum of its proper divisors (114346).

228686 is a wasteful number, since it uses less digits than its factorization.

228686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114345.

The product of its digits is 9216, while the sum is 32.

The square root of 228686 is about 478.2112503905. The cubic root of 228686 is about 61.1523558730.

The spelling of 228686 in words is "two hundred twenty-eight thousand, six hundred eighty-six".