229909 has 4 divisors (see below), whose sum is σ = 233740. Its totient is φ = 226080.

The previous prime is 229903. The next prime is 229937. The reversal of 229909 is 909922.

229909 = T₃₉₀ + T₃₉₁ + T₃₉₂.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87025 + 142884 = 295^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 229909 - 2⁷ = 229781 is a prime.

It is a Duffinian number.

229909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229903) 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 3 ways as a sum of consecutive naturals, for example, 1824 + ... + 1945.

It is an arithmetic number, because the mean of its divisors is an integer number (58435).

2²²⁹⁹⁰⁹ is an apocalyptic number.

229909 is the 392-nd centered triangular number.

It is an amenable number.

229909 is a deficient number, since it is larger than the sum of its proper divisors (3831).

229909 is an equidigital number, since it uses as much as digits as its factorization.

229909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 229909 is about 479.4882688867. The cubic root of 229909 is about 61.2611752482.

The spelling of 229909 in words is "two hundred twenty-nine thousand, nine hundred nine".