228390009 has 4 divisors (see below), whose sum is σ = 304520016. Its totient is φ = 152260004.

The previous prime is 228390007. The next prime is 228390017. The reversal of 228390009 is 900093822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228390009 - 2¹ = 228390007 is a prime.

It is a super-2 number, since 2×228390009² = 104323992422040162, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228390007) 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 3 ways as a sum of consecutive naturals, for example, 38064999 + ... + 38065004.

It is an arithmetic number, because the mean of its divisors is an integer number (76130004).

Almost surely, 2^228390009 is an apocalyptic number.

It is an amenable number.

228390009 is a deficient number, since it is larger than the sum of its proper divisors (76130007).

228390009 is an equidigital number, since it uses as much as digits as its factorization.

228390009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76130006.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 228390009 is about 15112.5778409906. The cubic root of 228390009 is about 611.2596107572.

The spelling of 228390009 in words is "two hundred twenty-eight million, three hundred ninety thousand, nine".