129348979 has 4 divisors (see below), whose sum is σ = 136156840. Its totient is φ = 122541120.

The previous prime is 129348931. The next prime is 129349021. The reversal of 129348979 is 979843921.

It is a happy number.

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 129348979 - 2⁷ = 129348851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129348179) 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, 3403902 + ... + 3403939.

It is an arithmetic number, because the mean of its divisors is an integer number (34039210).

Almost surely, 2^129348979 is an apocalyptic number.

129348979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129348979 is a deficient number, since it is larger than the sum of its proper divisors (6807861).

129348979 is an equidigital number, since it uses as much as digits as its factorization.

129348979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807860.

The product of its digits is 979776, while the sum is 52.

The square root of 129348979 is about 11373.1692592698. The cubic root of 129348979 is about 505.7326606768.

The spelling of 129348979 in words is "one hundred twenty-nine million, three hundred forty-eight thousand, nine hundred seventy-nine".