129161400 has 96 divisors (see below), whose sum is σ = 407079600. Its totient is φ = 33868800.

The previous prime is 129161317. The next prime is 129161401. The reversal of 129161400 is 4161921.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129161401) 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, 34836 + ... + 38364.

Almost surely, 2^129161400 is an apocalyptic number.

129161400 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 129161400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203539800).

129161400 is an abundant number, since it is smaller than the sum of its proper divisors (277918200).

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

129161400 is a wasteful number, since it uses less digits than its factorization.

129161400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609 (or 3600 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 129161400 is about 11364.9197093512. The cubic root of 129161400 is about 505.4880750053.

The spelling of 129161400 in words is "one hundred twenty-nine million, one hundred sixty-one thousand, four hundred".