228423809 has 2 divisors, whose sum is σ = 228423810. Its totient is φ = 228423808.

The previous prime is 228423803. The next prime is 228423823. The reversal of 228423809 is 908324822.

228423809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127622209 + 100801600 = 11297^2 + 10040^2 .

It is a cyclic number.

It is not a de Polignac number, because 228423809 - 2¹² = 228419713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (228423803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114211904 + 114211905.

It is an arithmetic number, because the mean of its divisors is an integer number (114211905).

Almost surely, 2^228423809 is an apocalyptic number.

It is an amenable number.

228423809 is a deficient number, since it is larger than the sum of its proper divisors (1).

228423809 is an equidigital number, since it uses as much as digits as its factorization.

228423809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 228423809 is about 15113.6960734296. The cubic root of 228423809 is about 611.2897632083.

The spelling of 228423809 in words is "two hundred twenty-eight million, four hundred twenty-three thousand, eight hundred nine".