129069885 has 16 divisors (see below), whose sum is σ = 236013696. Its totient is φ = 59003328.

The previous prime is 129069881. The next prime is 129069911. The reversal of 129069885 is 588960921.

It is a happy number.

It is not a de Polignac number, because 129069885 - 2² = 129069881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129069881) 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 15 ways as a sum of consecutive naturals, for example, 614514 + ... + 614723.

It is an arithmetic number, because the mean of its divisors is an integer number (14750856).

Almost surely, 2^129069885 is an apocalyptic number.

129069885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129069885 is a deficient number, since it is larger than the sum of its proper divisors (106943811).

129069885 is a wasteful number, since it uses less digits than its factorization.

129069885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229252.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 129069885 is about 11360.8927906217. The cubic root of 129069885 is about 505.3686619531.

It can be divided in two parts, 12906 and 9885, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 129069885 in words is "one hundred twenty-nine million, sixty-nine thousand, eight hundred eighty-five".