129847956 has 24 divisors (see below), whose sum is σ = 346261440. Its totient is φ = 37099392.

The previous prime is 129847951. The next prime is 129847969. The reversal of 129847956 is 659748921.

It is a junction number, because it is equal to n+sod(n) for n = 129847899 and 129847908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129847951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772821 + ... + 772988.

It is an arithmetic number, because the mean of its divisors is an integer number (14427560).

Almost surely, 2^129847956 is an apocalyptic number.

It is an amenable number.

129847956 is an abundant number, since it is smaller than the sum of its proper divisors (216413484).

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

129847956 is a wasteful number, since it uses less digits than its factorization.

129847956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545823 (or 1545821 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 129847956 is about 11395.0847298298. The cubic root of 129847956 is about 506.3821315219.

The spelling of 129847956 in words is "one hundred twenty-nine million, eight hundred forty-seven thousand, nine hundred fifty-six".