228139233 has 16 divisors (see below), whose sum is σ = 348072960. Its totient is φ = 130203216.

The previous prime is 228139229. The next prime is 228139237. The reversal of 228139233 is 332931822.

It is an interprime number because it is at equal distance from previous prime (228139229) and next prime (228139237).

It is not a de Polignac number, because 228139233 - 2² = 228139229 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 228139194 and 228139203.

It is not an unprimeable number, because it can be changed into a prime (228139237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11716 + ... + 24362.

It is an arithmetic number, because the mean of its divisors is an integer number (21754560).

Almost surely, 2^228139233 is an apocalyptic number.

It is an amenable number.

228139233 is a deficient number, since it is larger than the sum of its proper divisors (119933727).

228139233 is a wasteful number, since it uses less digits than its factorization.

228139233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13516.

The product of its digits is 15552, while the sum is 33.

The square root of 228139233 is about 15104.2786322287. The cubic root of 228139233 is about 611.0358044419.

It can be divided in two parts, 2281 and 39233, that added together give a palindrome (41514).

The spelling of 228139233 in words is "two hundred twenty-eight million, one hundred thirty-nine thousand, two hundred thirty-three".