129320406 has 48 divisors (see below), whose sum is σ = 295446528. Its totient is φ = 40820400.

The previous prime is 129320383. The next prime is 129320407. The reversal of 129320406 is 604023921.

It is a self number, because there is not a number n which added to its sum of digits gives 129320406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129320407) 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, 23761 + ... + 28691.

It is an arithmetic number, because the mean of its divisors is an integer number (6155136).

Almost surely, 2^129320406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129320406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147723264).

129320406 is an abundant number, since it is smaller than the sum of its proper divisors (166126122).

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

129320406 is a wasteful number, since it uses less digits than its factorization.

129320406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5017 (or 5014 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 129320406 is about 11371.9130316759. The cubic root of 129320406 is about 505.6954193999.

The spelling of 129320406 in words is "one hundred twenty-nine million, three hundred twenty thousand, four hundred six".