129123076 has 12 divisors (see below), whose sum is σ = 226045260. Its totient is φ = 64538720.

The previous prime is 129123073. The next prime is 129123083. The reversal of 129123076 is 670321921.

129123076 = 2308² + 2309² + ... + 2331².

It can be written as a sum of positive squares in 2 ways, for example, as 46785600 + 82337476 = 6840^2 + 9074^2 .

It is not an unprimeable number, because it can be changed into a prime (129123073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17646 + ... + 23866.

It is an arithmetic number, because the mean of its divisors is an integer number (18837105).

Almost surely, 2^129123076 is an apocalyptic number.

It is an amenable number.

129123076 is a deficient number, since it is larger than the sum of its proper divisors (96922184).

129123076 is a wasteful number, since it uses less digits than its factorization.

129123076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11414 (or 11412 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 129123076 is about 11363.2335186777. The cubic root of 129123076 is about 505.4380749245.

Adding to 129123076 its reverse (670321921), we get a palindrome (799444997).

The spelling of 129123076 in words is "one hundred twenty-nine million, one hundred twenty-three thousand, seventy-six".