129430815 has 16 divisors (see below), whose sum is σ = 208290528. Its totient is φ = 68629376.

The previous prime is 129430813. The next prime is 129430841. The reversal of 129430815 is 518034921.

It is a cyclic number.

It is not a de Polignac number, because 129430815 - 2¹ = 129430813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129430811) 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 15 ways as a sum of consecutive naturals, for example, 22344 + ... + 27533.

It is an arithmetic number, because the mean of its divisors is an integer number (13018158).

Almost surely, 2^129430815 is an apocalyptic number.

129430815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129430815 is a deficient number, since it is larger than the sum of its proper divisors (78859713).

129430815 is a wasteful number, since it uses less digits than its factorization.

129430815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50058.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 129430815 is about 11376.7664562476. The cubic root of 129430815 is about 505.8392931713.

The spelling of 129430815 in words is "one hundred twenty-nine million, four hundred thirty thousand, eight hundred fifteen".