228742 has 4 divisors (see below), whose sum is σ = 343116. Its totient is φ = 114370.

The previous prime is 228737. The next prime is 228751. The reversal of 228742 is 247822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247822 = 2 ⋅123911.

It is a congruent number.

It is an unprimeable number.

228742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57184 + ... + 57187.

It is an arithmetic number, because the mean of its divisors is an integer number (85779).

2²²⁸⁷⁴² is an apocalyptic number.

228742 is a deficient number, since it is larger than the sum of its proper divisors (114374).

228742 is a wasteful number, since it uses less digits than its factorization.

228742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114373.

The product of its digits is 1792, while the sum is 25.

The square root of 228742 is about 478.2697983356. The cubic root of 228742 is about 61.1573470726.

The spelling of 228742 in words is "two hundred twenty-eight thousand, seven hundred forty-two".