129280900 has 36 divisors (see below), whose sum is σ = 320618368. Its totient is φ = 44324640.

The previous prime is 129280897. The next prime is 129280901. The reversal of 129280900 is 9082921.

It is a super-2 number, since 2×129280900² = 33427102209620000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129280901) 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, 91644 + ... + 93043.

Almost surely, 2^129280900 is an apocalyptic number.

129280900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129280900 is an abundant number, since it is smaller than the sum of its proper divisors (191337468).

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

129280900 is a wasteful number, since it uses less digits than its factorization.

129280900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184708 (or 184701 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 129280900 is about 11370.1759001345. The cubic root of 129280900 is about 505.6439193091.

The spelling of 129280900 in words is "one hundred twenty-nine million, two hundred eighty thousand, nine hundred".