129727936 has 56 divisors (see below), whose sum is σ = 284067504. Its totient is φ = 58398720.

The previous prime is 129727931. The next prime is 129727967. The reversal of 129727936 is 639727921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129727931) 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 7 ways as a sum of consecutive naturals, for example, 32211 + ... + 36013.

It is an arithmetic number, because the mean of its divisors is an integer number (5072634).

Almost surely, 2^129727936 is an apocalyptic number.

129727936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129727936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142033752).

129727936 is an abundant number, since it is smaller than the sum of its proper divisors (154339568).

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

129727936 is a wasteful number, since it uses less digits than its factorization.

129727936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869 (or 3859 counting only the distinct ones).

The product of its digits is 285768, while the sum is 46.

The square root of 129727936 is about 11389.8172066105. The cubic root of 129727936 is about 506.2260650981.

The spelling of 129727936 in words is "one hundred twenty-nine million, seven hundred twenty-seven thousand, nine hundred thirty-six".