29809 has 4 divisors (see below), whose sum is σ = 32116. Its totient is φ = 27504.

The previous prime is 29803. The next prime is 29819. The reversal of 29809 is 90892.

It is a happy number.

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 6400 + 23409 = 80^2 + 153^2 .

It is a cyclic number.

It is not a de Polignac number, because 29809 - 2⁹ = 29297 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1134 + ... + 1159.

It is an arithmetic number, because the mean of its divisors is an integer number (8029).

2²⁹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

29809 is a deficient number, since it is larger than the sum of its proper divisors (2307).

29809 is a wasteful number, since it uses less digits than its factorization.

29809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 29809 is about 172.6528308485. The cubic root of 29809 is about 31.0062422393.

It can be divided in two parts, 29 and 809, that added together give a palindrome (838).

The spelling of 29809 in words is "twenty-nine thousand, eight hundred nine".