129200000 has 192 divisors, whose sum is σ = 358570800. Its totient is φ = 46080000.

The previous prime is 129199969. The next prime is 129200009. The reversal of 129200000 is 2921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129200009) 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, 6799991 + ... + 6800009.

Almost surely, 2^129200000 is an apocalyptic number.

129200000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179285400).

129200000 is an abundant number, since it is smaller than the sum of its proper divisors (229370800).

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

129200000 is an frugal number, since it uses more digits than its factorization.

129200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 129200000 is about 11366.6177907063. The cubic root of 129200000 is about 505.5384251778.

Adding to 129200000 its reverse (2921), we get a palindrome (129202921).

The spelling of 129200000 in words is "one hundred twenty-nine million, two hundred thousand".