228138956 has 12 divisors (see below), whose sum is σ = 403359768. Its totient is φ = 112893312.

The previous prime is 228138949. The next prime is 228138959. The reversal of 228138956 is 659831822.

It is not an unprimeable number, because it can be changed into a prime (228138959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293606 + ... + 294381.

It is an arithmetic number, because the mean of its divisors is an integer number (33613314).

Almost surely, 2^228138956 is an apocalyptic number.

It is an amenable number.

228138956 is a deficient number, since it is larger than the sum of its proper divisors (175220812).

228138956 is a wasteful number, since it uses less digits than its factorization.

228138956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588088 (or 588086 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 228138956 is about 15104.2694626387. The cubic root of 228138956 is about 611.0355571412.

The spelling of 228138956 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, nine hundred fifty-six".