129896536 has 64 divisors (see below), whose sum is σ = 304980480. Its totient is φ = 50388480.

The previous prime is 129896513. The next prime is 129896549. The reversal of 129896536 is 635698921.

It is a super-2 number, since 2×129896536² = 33746220129598592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129896536.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266485 + ... + 266971.

It is an arithmetic number, because the mean of its divisors is an integer number (4765320).

Almost surely, 2^129896536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129896536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152490240).

129896536 is an abundant number, since it is smaller than the sum of its proper divisors (175083944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129896536 is a wasteful number, since it uses less digits than its factorization.

129896536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944 (or 940 counting only the distinct ones).

The product of its digits is 699840, while the sum is 49.

The square root of 129896536 is about 11397.2161513240. The cubic root of 129896536 is about 506.4452745431.

The spelling of 129896536 in words is "one hundred twenty-nine million, eight hundred ninety-six thousand, five hundred thirty-six".