228738933 has 12 divisors (see below), whose sum is σ = 344766240. Its totient is φ = 145862376.

The previous prime is 228738911. The next prime is 228738943. The reversal of 228738933 is 339837822.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-228738933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228738943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 552303 + ... + 552716.

It is an arithmetic number, because the mean of its divisors is an integer number (28730520).

Almost surely, 2^228738933 is an apocalyptic number.

228738933 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

228738933 is a deficient number, since it is larger than the sum of its proper divisors (116027307).

228738933 is a wasteful number, since it uses less digits than its factorization.

228738933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105048 (or 1105045 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 228738933 is about 15124.1175940945. The cubic root of 228738933 is about 611.5707373642.

The spelling of 228738933 in words is "two hundred twenty-eight million, seven hundred thirty-eight thousand, nine hundred thirty-three".