129912215 has 32 divisors (see below), whose sum is σ = 174985920. Its totient is φ = 92012544.

The previous prime is 129912193. The next prime is 129912221. The reversal of 129912215 is 512219921.

It is a cyclic number.

It is not a de Polignac number, because 129912215 - 2⁶ = 129912151 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 414899 + ... + 415211.

It is an arithmetic number, because the mean of its divisors is an integer number (5468310).

Almost surely, 2^129912215 is an apocalyptic number.

129912215 is a deficient number, since it is larger than the sum of its proper divisors (45073705).

129912215 is a wasteful number, since it uses less digits than its factorization.

129912215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its digits is 3240, while the sum is 32.

The square root of 129912215 is about 11397.9039739770. The cubic root of 129912215 is about 506.4656503392.

The spelling of 129912215 in words is "one hundred twenty-nine million, nine hundred twelve thousand, two hundred fifteen".