228405321 has 6 divisors (see below), whose sum is σ = 329918810. Its totient is φ = 152270208.

The previous prime is 228405313. The next prime is 228405323. The reversal of 228405321 is 123504822.

228405321 is a `hidden beast` number, since 228 + 405 + 32 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 219188025 + 9217296 = 14805^2 + 3036^2 .

It is not a de Polignac number, because 228405321 - 2³ = 228405313 is a prime.

It is a super-2 number, since 2×228405321² = 104337981322226082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228405323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12689176 + ... + 12689193.

Almost surely, 2^228405321 is an apocalyptic number.

It is an amenable number.

228405321 is a deficient number, since it is larger than the sum of its proper divisors (101513489).

228405321 is a wasteful number, since it uses less digits than its factorization.

228405321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25378375 (or 25378372 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 228405321 is about 15113.0844303868. The cubic root of 228405321 is about 611.2732707213.

The spelling of 228405321 in words is "two hundred twenty-eight million, four hundred five thousand, three hundred twenty-one".