129388895 has 4 divisors (see below), whose sum is σ = 155266680. Its totient is φ = 103511112.

The previous prime is 129388891. The next prime is 129388901. The reversal of 129388895 is 598883921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 598883921 = 103 ⋅5814407.

It is a cyclic number.

It is not a de Polignac number, because 129388895 - 2² = 129388891 is a prime.

It is a super-2 number, since 2×129388895² = 33482972298642050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129388891) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12938885 + ... + 12938894.

It is an arithmetic number, because the mean of its divisors is an integer number (38816670).

Almost surely, 2^129388895 is an apocalyptic number.

129388895 is a deficient number, since it is larger than the sum of its proper divisors (25877785).

129388895 is an equidigital number, since it uses as much as digits as its factorization.

129388895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25877784.

The product of its digits is 1244160, while the sum is 53.

The square root of 129388895 is about 11374.9239557898. The cubic root of 129388895 is about 505.7846769327.

The spelling of 129388895 in words is "one hundred twenty-nine million, three hundred eighty-eight thousand, eight hundred ninety-five".