129541900 has 36 divisors (see below), whose sum is σ = 282825648. Its totient is φ = 51499840.

The previous prime is 129541891. The next prime is 129541913. The reversal of 129541900 is 9145921.

It is a super-2 number, since 2×129541900² = 33562207711220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12822 + ... + 20578.

It is an arithmetic number, because the mean of its divisors is an integer number (7856268).

Almost surely, 2^129541900 is an apocalyptic number.

129541900 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 129541900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141412824).

129541900 is an abundant number, since it is smaller than the sum of its proper divisors (153283748).

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

129541900 is a wasteful number, since it uses less digits than its factorization.

129541900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7938 (or 7931 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 129541900 is about 11381.6475081598. The cubic root of 129541900 is about 505.9839652884.

The spelling of 129541900 in words is "one hundred twenty-nine million, five hundred forty-one thousand, nine hundred".