129884085 has 24 divisors (see below), whose sum is σ = 225714840. Its totient is φ = 69092352.

The previous prime is 129883993. The next prime is 129884087. The reversal of 129884085 is 580488921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 85488516 + 44395569 = 9246^2 + 6663^2 .

It is not a de Polignac number, because 129884085 - 2⁹ = 129883573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 129884085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129884087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14877 + ... + 21933.

It is an arithmetic number, because the mean of its divisors is an integer number (9404785).

Almost surely, 2^129884085 is an apocalyptic number.

129884085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129884085 is a deficient number, since it is larger than the sum of its proper divisors (95830755).

129884085 is a wasteful number, since it uses less digits than its factorization.

129884085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7477 (or 7474 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 129884085 is about 11396.6699083548. The cubic root of 129884085 is about 506.4290925575.

The spelling of 129884085 in words is "one hundred twenty-nine million, eight hundred eighty-four thousand, eighty-five".