129276369 has 12 divisors (see below), whose sum is σ = 187026996. Its totient is φ = 86048352.

The previous prime is 129276359. The next prime is 129276373. The reversal of 129276369 is 963672921.

It is a happy number.

129276369 is a `hidden beast` number, since 1 + 2 + 9 + 2 + 7 + 636 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 56430144 + 72846225 = 7512^2 + 8535^2 .

It is not a de Polignac number, because 129276369 - 2⁵ = 129276337 is a prime.

It is a super-2 number, since 2×129276369² = 33424759163648322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (129276319) 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, 5122 + ... + 16875.

It is an arithmetic number, because the mean of its divisors is an integer number (15585583).

Almost surely, 2^129276369 is an apocalyptic number.

It is an amenable number.

129276369 is a deficient number, since it is larger than the sum of its proper divisors (57750627).

129276369 is a wasteful number, since it uses less digits than its factorization.

129276369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22656 (or 22653 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 129276369 is about 11369.9766490525. The cubic root of 129276369 is about 505.6380120189.

The spelling of 129276369 in words is "one hundred twenty-nine million, two hundred seventy-six thousand, three hundred sixty-nine".