129691232 has 48 divisors (see below), whose sum is σ = 294939792. Its totient is φ = 55480320.

The previous prime is 129691223. The next prime is 129691271. The reversal of 129691232 is 232196921.

It is a junction number, because it is equal to n+sod(n) for n = 129691192 and 129691201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4853 + ... + 16820.

It is an arithmetic number, because the mean of its divisors is an integer number (6144579).

Almost surely, 2^129691232 is an apocalyptic number.

It is an amenable number.

129691232 is an abundant number, since it is smaller than the sum of its proper divisors (165248560).

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

129691232 is a wasteful number, since it uses less digits than its factorization.

129691232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21711 (or 21703 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 129691232 is about 11388.2058288389. The cubic root of 129691232 is about 506.1783183170.

The spelling of 129691232 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, two hundred thirty-two".