129084915 has 16 divisors (see below), whose sum is σ = 207036576. Its totient is φ = 68678400.

The previous prime is 129084913. The next prime is 129084919. The reversal of 129084915 is 519480921.

It is not a de Polignac number, because 129084915 - 2¹ = 129084913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129084913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3906 + ... + 16535.

It is an arithmetic number, because the mean of its divisors is an integer number (12939786).

Almost surely, 2^129084915 is an apocalyptic number.

129084915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129084915 is a deficient number, since it is larger than the sum of its proper divisors (77951661).

129084915 is a wasteful number, since it uses less digits than its factorization.

129084915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20870.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 129084915 is about 11361.5542510697. The cubic root of 129084915 is about 505.3882776731.

The spelling of 129084915 in words is "one hundred twenty-nine million, eighty-four thousand, nine hundred fifteen".