129923115 has 16 divisors (see below), whose sum is σ = 237573888. Its totient is φ = 59393376.

The previous prime is 129923111. The next prime is 129923119. The reversal of 129923115 is 511329921.

It is an interprime number because it is at equal distance from previous prime (129923111) and next prime (129923119).

It is not a de Polignac number, because 129923115 - 2² = 129923111 is a prime.

It is a super-2 number, since 2×129923115² = 33760031622606450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129923111) 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 15 ways as a sum of consecutive naturals, for example, 618577 + ... + 618786.

It is an arithmetic number, because the mean of its divisors is an integer number (14848368).

Almost surely, 2^129923115 is an apocalyptic number.

129923115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129923115 is a deficient number, since it is larger than the sum of its proper divisors (107650773).

129923115 is a wasteful number, since it uses less digits than its factorization.

129923115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237378.

The product of its digits is 4860, while the sum is 33.

The square root of 129923115 is about 11398.3821220382. The cubic root of 129923115 is about 506.4798145736.

The spelling of 129923115 in words is "one hundred twenty-nine million, nine hundred twenty-three thousand, one hundred fifteen".