129426215 has 8 divisors (see below), whose sum is σ = 155372688. Its totient is φ = 103500160.

The previous prime is 129426197. The next prime is 129426251. The reversal of 129426215 is 512624921.

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

It is not a de Polignac number, because 129426215 - 2²⁶ = 62317351 is a prime.

It is a super-2 number, since 2×129426215² = 33502290258452450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20864 + ... + 26346.

It is an arithmetic number, because the mean of its divisors is an integer number (19421586).

Almost surely, 2^129426215 is an apocalyptic number.

129426215 is a deficient number, since it is larger than the sum of its proper divisors (25946473).

129426215 is an equidigital number, since it uses as much as digits as its factorization.

129426215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10209.

The product of its digits is 8640, while the sum is 32.

The square root of 129426215 is about 11376.5642880441. The cubic root of 129426215 is about 505.8333005533.

The spelling of 129426215 in words is "one hundred twenty-nine million, four hundred twenty-six thousand, two hundred fifteen".