129215 has 8 divisors (see below), whose sum is σ = 158928. Its totient is φ = 100800.

The previous prime is 129209. The next prime is 129221. The reversal of 129215 is 512921.

It is an interprime number because it is at equal distance from previous prime (129209) and next prime (129221).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129215 - 2⁸ = 128959 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129215.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86 + ... + 515.

It is an arithmetic number, because the mean of its divisors is an integer number (19866).

2¹²⁹²¹⁵ is an apocalyptic number.

129215 is a deficient number, since it is larger than the sum of its proper divisors (29713).

129215 is an equidigital number, since it uses as much as digits as its factorization.

129215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649.

The product of its digits is 180, while the sum is 20.

The square root of 129215 is about 359.4648800648. The cubic root of 129215 is about 50.5557988601. Note that the first 3 decimals are identical.

The spelling of 129215 in words is "one hundred twenty-nine thousand, two hundred fifteen".