228993 has 8 divisors (see below), whose sum is σ = 313728. Its totient is φ = 148464.

The previous prime is 228989. The next prime is 229003. The reversal of 228993 is 399822.

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

It is not a de Polignac number, because 228993 - 2² = 228989 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921 + ... + 1142.

It is an arithmetic number, because the mean of its divisors is an integer number (39216).

2²²⁸⁹⁹³ is an apocalyptic number.

It is an amenable number.

228993 is a deficient number, since it is larger than the sum of its proper divisors (84735).

228993 is a wasteful number, since it uses less digits than its factorization.

228993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103.

The product of its digits is 7776, while the sum is 33.

The square root of 228993 is about 478.5321305827. The cubic root of 228993 is about 61.1797083396.

It can be divided in two parts, 228 and 993, that added together give a palindrome (1221).

The spelling of 228993 in words is "two hundred twenty-eight thousand, nine hundred ninety-three".