229709 has 6 divisors (see below), whose sum is σ = 240330. Its totient is φ = 219296.

The previous prime is 229703. The next prime is 229711. The reversal of 229709 is 907922.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1225 + 228484 = 35^2 + 478^2 .

It is not a de Polignac number, because 229709 - 2⁴ = 229693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2537 + ... + 2625.

It is an arithmetic number, because the mean of its divisors is an integer number (40055).

2²²⁹⁷⁰⁹ is an apocalyptic number.

229709 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

229709 is a deficient number, since it is larger than the sum of its proper divisors (10621).

229709 is an frugal number, since it uses more digits than its factorization.

229709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 229709 is about 479.2796678350. The cubic root of 229709 is about 61.2434062040.

Multiplying 229709 by its sum of digits (29), we get a square (6661561 = 2581²).

229709 divided by its sum of digits (29) gives a square (7921 = 89²).

The spelling of 229709 in words is "two hundred twenty-nine thousand, seven hundred nine".