228998138 has 4 divisors (see below), whose sum is σ = 343497210. Its totient is φ = 114499068.

The previous prime is 228998137. The next prime is 228998141. The reversal of 228998138 is 831899822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 227315929 + 1682209 = 15077^2 + 1297^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228998131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57249533 + ... + 57249536.

Almost surely, 2^228998138 is an apocalyptic number.

228998138 is a deficient number, since it is larger than the sum of its proper divisors (114499072).

228998138 is a wasteful number, since it uses less digits than its factorization.

228998138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114499071.

The product of its digits is 497664, while the sum is 50.

The square root of 228998138 is about 15132.6844280848. The cubic root of 228998138 is about 611.8016590674.

The spelling of 228998138 in words is "two hundred twenty-eight million, nine hundred ninety-eight thousand, one hundred thirty-eight".