29905 has 4 divisors (see below), whose sum is σ = 35892. Its totient is φ = 23920.

The previous prime is 29881. The next prime is 29917. The reversal of 29905 is 50992.

29905 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 4624 + 25281 = 68^2 + 159^2 .

It is not a de Polignac number, because 29905 - 2⁵ = 29873 is a prime.

It is a Duffinian number.

29905 is strictly pandigital in base 6.

29905 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 29905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2986 + ... + 2995.

It is an arithmetic number, because the mean of its divisors is an integer number (8973).

2²⁹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

29905 is a deficient number, since it is larger than the sum of its proper divisors (5987).

29905 is an equidigital number, since it uses as much as digits as its factorization.

29905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5986.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 29905 is about 172.9306219268. The cubic root of 29905 is about 31.0394918125.

The spelling of 29905 in words is "twenty-nine thousand, nine hundred five".