129284907 has 4 divisors (see below), whose sum is σ = 172379880. Its totient is φ = 86189936.

The previous prime is 129284893. The next prime is 129284923. The reversal of 129284907 is 709482921.

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 129284907 - 2⁸ = 129284651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129284957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21547482 + ... + 21547487.

It is an arithmetic number, because the mean of its divisors is an integer number (43094970).

Almost surely, 2^129284907 is an apocalyptic number.

129284907 is a deficient number, since it is larger than the sum of its proper divisors (43094973).

129284907 is an equidigital number, since it uses as much as digits as its factorization.

129284907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43094972.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 129284907 is about 11370.3521053660. The cubic root of 129284907 is about 505.6491433194.

The spelling of 129284907 in words is "one hundred twenty-nine million, two hundred eighty-four thousand, nine hundred seven".