129804215 has 4 divisors (see below), whose sum is σ = 155765064. Its totient is φ = 103843368.

The previous prime is 129804187. The next prime is 129804217. The reversal of 129804215 is 512408921.

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

It is a cyclic number.

It is not a de Polignac number, because 129804215 - 2⁶ = 129804151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129804217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12980417 + ... + 12980426.

It is an arithmetic number, because the mean of its divisors is an integer number (38941266).

Almost surely, 2^129804215 is an apocalyptic number.

129804215 is a deficient number, since it is larger than the sum of its proper divisors (25960849).

129804215 is an equidigital number, since it uses as much as digits as its factorization.

129804215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25960848.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 129804215 is about 11393.1652757256. The cubic root of 129804215 is about 506.3252646316.

The spelling of 129804215 in words is "one hundred twenty-nine million, eight hundred four thousand, two hundred fifteen".