228739 has 8 divisors (see below), whose sum is σ = 268128. Its totient is φ = 191040.

The previous prime is 228737. The next prime is 228751. The reversal of 228739 is 937822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228739 - 2¹ = 228737 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 228739.

It is not an unprimeable number, because it can be changed into a prime (228731) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 112 + ... + 685.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2²²⁸⁷³⁹ is an apocalyptic number.

228739 is a deficient number, since it is larger than the sum of its proper divisors (39389).

228739 is an equidigital number, since it uses as much as digits as its factorization.

228739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

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

The square root of 228739 is about 478.2666620203. The cubic root of 228739 is about 61.1570797076.

The spelling of 228739 in words is "two hundred twenty-eight thousand, seven hundred thirty-nine".