129209346 has 48 divisors (see below), whose sum is σ = 325211328. Its totient is φ = 36309600.

The previous prime is 129209321. The next prime is 129209359. The reversal of 129209346 is 643902921.

It is a super-3 number, since 3×129209346³ (a number of 25 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 129209346.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 720 + ... + 16091.

It is an arithmetic number, because the mean of its divisors is an integer number (6775236).

Almost surely, 2^129209346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129209346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162605664).

129209346 is an abundant number, since it is smaller than the sum of its proper divisors (196001982).

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

129209346 is a wasteful number, since it uses less digits than its factorization.

129209346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16887 (or 16884 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 129209346 is about 11367.0288994090. The cubic root of 129209346 is about 505.5506146726.

The spelling of 129209346 in words is "one hundred twenty-nine million, two hundred nine thousand, three hundred forty-six".