129299799 has 4 divisors (see below), whose sum is σ = 172399736. Its totient is φ = 86199864.

The previous prime is 129299783. The next prime is 129299801. The reversal of 129299799 is 997992921.

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

It is not a de Polignac number, because 129299799 - 2⁴ = 129299783 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 (129299699) 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, 21549964 + ... + 21549969.

It is an arithmetic number, because the mean of its divisors is an integer number (43099934).

Almost surely, 2^129299799 is an apocalyptic number.

129299799 is a deficient number, since it is larger than the sum of its proper divisors (43099937).

129299799 is an equidigital number, since it uses as much as digits as its factorization.

129299799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43099936.

The product of its digits is 1653372, while the sum is 57.

The square root of 129299799 is about 11371.0069474959. The cubic root of 129299799 is about 505.6685573874.

The spelling of 129299799 in words is "one hundred twenty-nine million, two hundred ninety-nine thousand, seven hundred ninety-nine".