129276900 has 81 divisors (see below), whose sum is σ = 406283241. Its totient is φ = 34382880.

The previous prime is 129276887. The next prime is 129276937. The reversal of 129276900 is 9672921.

The square root of 129276900 is 11370.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 46539684 + 82737216 = 6822^2 + 9096^2 .

It is a super-2 number, since 2×129276900² = 33425033747220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 340911 + ... + 341289.

Almost surely, 2^129276900 is an apocalyptic number.

129276900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129276900 is the 11370-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129276900

129276900 is an abundant number, since it is smaller than the sum of its proper divisors (277006341).

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

129276900 is a wasteful number, since it uses less digits than its factorization.

129276900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The cubic root of 129276900 is about 505.6387043172.

Multiplying 129276900 by its sum of digits (36), we get a square (4653968400 = 68220²).

129276900 divided by its sum of digits (36) gives a square (3591025 = 1895²).

The spelling of 129276900 in words is "one hundred twenty-nine million, two hundred seventy-six thousand, nine hundred".