228638237 has 18 divisors (see below), whose sum is σ = 244355454. Its totient is φ = 213847920.

The previous prime is 228638231. The next prime is 228638243. The reversal of 228638237 is 732836822.

It is an interprime number because it is at equal distance from previous prime (228638231) and next prime (228638243).

It can be written as a sum of positive squares in only one way, i.e., 211382521 + 17255716 = 14539^2 + 4154^2 .

It is a de Polignac number, because none of the positive numbers 2^k-228638237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228638194 and 228638203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228638231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3412478 + ... + 3412544.

It is an arithmetic number, because the mean of its divisors is an integer number (13575303).

Almost surely, 2^228638237 is an apocalyptic number.

It is an amenable number.

228638237 is a deficient number, since it is larger than the sum of its proper divisors (15717217).

228638237 is an frugal number, since it uses more digits than its factorization.

228638237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 151 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 228638237 is about 15120.7882400356. The cubic root of 228638237 is about 611.4809818147.

The spelling of 228638237 in words is "two hundred twenty-eight million, six hundred thirty-eight thousand, two hundred thirty-seven".