228918309 has 8 divisors (see below), whose sum is σ = 305888352. Its totient is φ = 152280240.

The previous prime is 228918281. The next prime is 228918343. The reversal of 228918309 is 903819822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228918309 - 2⁹ = 228917797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228918359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81379 + ... + 84144.

It is an arithmetic number, because the mean of its divisors is an integer number (38236044).

Almost surely, 2^228918309 is an apocalyptic number.

It is an amenable number.

228918309 is a deficient number, since it is larger than the sum of its proper divisors (76970043).

228918309 is a wasteful number, since it uses less digits than its factorization.

228918309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165987.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 228918309 is about 15130.0465630480. The cubic root of 228918309 is about 611.7305592303.

The spelling of 228918309 in words is "two hundred twenty-eight million, nine hundred eighteen thousand, three hundred nine".