129645936 has 120 divisors (see below), whose sum is σ = 424910304. Its totient is φ = 36126720.

The previous prime is 129645931. The next prime is 129645953. The reversal of 129645936 is 639546921.

It is a junction number, because it is equal to n+sod(n) for n = 129645891 and 129645900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129645931) 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, 39760 + ... + 42896.

Almost surely, 2^129645936 is an apocalyptic number.

129645936 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 129645936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212455152).

129645936 is an abundant number, since it is smaller than the sum of its proper divisors (295264368).

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

129645936 is a wasteful number, since it uses less digits than its factorization.

129645936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199 (or 3190 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 129645936 is about 11386.2169310092. The cubic root of 129645936 is about 506.1193821229.

The spelling of 129645936 in words is "one hundred twenty-nine million, six hundred forty-five thousand, nine hundred thirty-six".