129861504 has 192 divisors, whose sum is σ = 417690000. Its totient is φ = 38486016.

The previous prime is 129861499. The next prime is 129861541. The reversal of 129861504 is 405168921.

129861504 is a `hidden beast` number, since 1 + 2 + 98 + 61 + 504 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×129861504² = 33728020442284032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 371922 + ... + 372270.

Almost surely, 2^129861504 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 129861504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208845000).

129861504 is an abundant number, since it is smaller than the sum of its proper divisors (287828496).

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

129861504 is a wasteful number, since it uses less digits than its factorization.

129861504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 129861504 is about 11395.6791811634. The cubic root of 129861504 is about 506.3997424435.

The spelling of 129861504 in words is "one hundred twenty-nine million, eight hundred sixty-one thousand, five hundred four".