129505400 has 24 divisors (see below), whose sum is σ = 301100520. Its totient is φ = 51802080.

The previous prime is 129505399. The next prime is 129505423. The reversal of 129505400 is 4505921.

It is a self number, because there is not a number n which added to its sum of digits gives 129505400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323564 + ... + 323963.

It is an arithmetic number, because the mean of its divisors is an integer number (12545855).

Almost surely, 2^129505400 is an apocalyptic number.

129505400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129505400 is an abundant number, since it is smaller than the sum of its proper divisors (171595120).

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

129505400 is a wasteful number, since it uses less digits than its factorization.

129505400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647543 (or 647534 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 129505400 is about 11380.0439366463. The cubic root of 129505400 is about 505.9364384532.

The spelling of 129505400 in words is "one hundred twenty-nine million, five hundred five thousand, four hundred".