129986536 has 8 divisors (see below), whose sum is σ = 243724770. Its totient is φ = 64993264.

The previous prime is 129986509. The next prime is 129986561. The reversal of 129986536 is 635689921.

It can be written as a sum of positive squares in only one way, i.e., 127825636 + 2160900 = 11306^2 + 1470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 129986536.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8124151 + ... + 8124166.

Almost surely, 2^129986536 is an apocalyptic number.

It is an amenable number.

129986536 is a deficient number, since it is larger than the sum of its proper divisors (113738234).

129986536 is a wasteful number, since it uses less digits than its factorization.

129986536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16248323 (or 16248319 counting only the distinct ones).

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

The square root of 129986536 is about 11401.1638002443. The cubic root of 129986536 is about 506.5622126163.

The spelling of 129986536 in words is "one hundred twenty-nine million, nine hundred eighty-six thousand, five hundred thirty-six".