129289400 has 48 divisors (see below), whose sum is σ = 307949040. Its totient is φ = 50451200.

The previous prime is 129289387. The next prime is 129289409. The reversal of 129289400 is 4982921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129289409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317 + ... + 16083.

It is an arithmetic number, because the mean of its divisors is an integer number (6415605).

Almost surely, 2^129289400 is an apocalyptic number.

129289400 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 129289400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153974520).

129289400 is an abundant number, since it is smaller than the sum of its proper divisors (178659640).

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

129289400 is a wasteful number, since it uses less digits than its factorization.

129289400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15824 (or 15815 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 129289400 is about 11370.5496788854. The cubic root of 129289400 is about 505.6550008097.

The spelling of 129289400 in words is "one hundred twenty-nine million, two hundred eighty-nine thousand, four hundred".