129427135 has 4 divisors (see below), whose sum is σ = 155312568. Its totient is φ = 103541704.

The previous prime is 129427099. The next prime is 129427159. The reversal of 129427135 is 531724921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129427135 - 2²³ = 121038527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129427135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12942709 + ... + 12942718.

It is an arithmetic number, because the mean of its divisors is an integer number (38828142).

Almost surely, 2^129427135 is an apocalyptic number.

129427135 is a deficient number, since it is larger than the sum of its proper divisors (25885433).

129427135 is an equidigital number, since it uses as much as digits as its factorization.

129427135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25885432.

The product of its digits is 15120, while the sum is 34.

The square root of 129427135 is about 11376.6047219722. The cubic root of 129427135 is about 505.8344990882.

The spelling of 129427135 in words is "one hundred twenty-nine million, four hundred twenty-seven thousand, one hundred thirty-five".