228318409 has 8 divisors (see below), whose sum is σ = 251134560. Its totient is φ = 207560980.

The previous prime is 228318403. The next prime is 228318427. The reversal of 228318409 is 904813822.

It is not a de Polignac number, because 228318409 - 2¹³ = 228310217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228318403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84439 + ... + 87100.

It is an arithmetic number, because the mean of its divisors is an integer number (31391820).

Almost surely, 2^228318409 is an apocalyptic number.

It is an amenable number.

228318409 is a deficient number, since it is larger than the sum of its proper divisors (22816151).

228318409 is an equidigital number, since it uses as much as digits as its factorization.

228318409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171572 (or 171550 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 228318409 is about 15110.2087675849. The cubic root of 228318409 is about 611.1957276906.

The spelling of 228318409 in words is "two hundred twenty-eight million, three hundred eighteen thousand, four hundred nine".