229905 has 32 divisors (see below), whose sum is σ = 443520. Its totient is φ = 112320.

The previous prime is 229903. The next prime is 229937. The reversal of 229905 is 509922.

It is not a de Polignac number, because 229905 - 2¹ = 229903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (229903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1690 + ... + 1820.

It is an arithmetic number, because the mean of its divisors is an integer number (13860).

2²²⁹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

229905 is a deficient number, since it is larger than the sum of its proper divisors (213615).

229905 is a wasteful number, since it uses less digits than its factorization.

229905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 229905 is about 479.4840977551. The cubic root of 229905 is about 61.2608199683.

229905 divided by its sum of digits (27) gives a triangular number (8515 = T₁₃₀).

The spelling of 229905 in words is "two hundred twenty-nine thousand, nine hundred five".