129824456 has 8 divisors (see below), whose sum is σ = 243420870. Its totient is φ = 64912224.

The previous prime is 129824449. The next prime is 129824459. The reversal of 129824456 is 654428921.

It can be written as a sum of positive squares in only one way, i.e., 91508356 + 38316100 = 9566^2 + 6190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (129824459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8114021 + ... + 8114036.

Almost surely, 2^129824456 is an apocalyptic number.

It is an amenable number.

129824456 is a deficient number, since it is larger than the sum of its proper divisors (113596414).

129824456 is a wasteful number, since it uses less digits than its factorization.

129824456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16228063 (or 16228059 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 129824456 is about 11394.0535368235. The cubic root of 129824456 is about 506.3515811807.

The spelling of 129824456 in words is "one hundred twenty-nine million, eight hundred twenty-four thousand, four hundred fifty-six".