228338431 has 4 divisors (see below), whose sum is σ = 236212200. Its totient is φ = 220464664.

The previous prime is 228338423. The next prime is 228338443. The reversal of 228338431 is 134833822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134833822 = 2 ⋅67416911.

It is a cyclic number.

It is not a de Polignac number, because 228338431 - 2³ = 228338423 is a prime.

It is a super-2 number, since 2×228338431² = 104276878143083522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228338491) 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, 3936841 + ... + 3936898.

It is an arithmetic number, because the mean of its divisors is an integer number (59053050).

Almost surely, 2^228338431 is an apocalyptic number.

228338431 is a deficient number, since it is larger than the sum of its proper divisors (7873769).

228338431 is an equidigital number, since it uses as much as digits as its factorization.

228338431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7873768.

The product of its digits is 27648, while the sum is 34.

The square root of 228338431 is about 15110.8712852701. The cubic root of 228338431 is about 611.2135930965.

The spelling of 228338431 in words is "two hundred twenty-eight million, three hundred thirty-eight thousand, four hundred thirty-one".