2228409 has 6 divisors (see below), whose sum is σ = 3218826. Its totient is φ = 1485600.

The previous prime is 2228407. The next prime is 2228417. The reversal of 2228409 is 9048222.

It can be written as a sum of positive squares in only one way, i.e., 2039184 + 189225 = 1428^2 + 435^2 .

It is not a de Polignac number, because 2228409 - 2¹ = 2228407 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 2⁷ + 2¹⁷ + 8⁷ + 4² + 0 + 9 .

It is a Curzon number.

2228409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2228407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123792 + ... + 123809.

It is an arithmetic number, because the mean of its divisors is an integer number (536471).

2^2228409 is an apocalyptic number.

It is an amenable number.

2228409 is a deficient number, since it is larger than the sum of its proper divisors (990417).

2228409 is a wasteful number, since it uses less digits than its factorization.

2228409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247607 (or 247604 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 2228409 is about 1492.7856510564. The cubic root of 2228409 is about 130.6165779083.

The spelling of 2228409 in words is "two million, two hundred twenty-eight thousand, four hundred nine".