129207232 has 112 divisors (see below), whose sum is σ = 323624448. Its totient is φ = 49720320.

The previous prime is 129207229. The next prime is 129207233. The reversal of 129207232 is 232702921.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×129207232² = 33389017602203648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 129207232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129207233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 773613 + ... + 773779.

It is an arithmetic number, because the mean of its divisors is an integer number (2889504).

Almost surely, 2^129207232 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 129207232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161812224).

129207232 is an abundant number, since it is smaller than the sum of its proper divisors (194417216).

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

129207232 is a wasteful number, since it uses less digits than its factorization.

129207232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 129207232 is about 11366.9359107897. The cubic root of 129207232 is about 505.5478575453.

The spelling of 129207232 in words is "one hundred twenty-nine million, two hundred seven thousand, two hundred thirty-two".