129420776 has 8 divisors (see below), whose sum is σ = 242663970. Its totient is φ = 64710384.

The previous prime is 129420727. The next prime is 129420803. The reversal of 129420776 is 677024921.

It can be written as a sum of positive squares in only one way, i.e., 129367876 + 52900 = 11374^2 + 230^2 .

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

It is an unprimeable number.

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, 8088791 + ... + 8088806.

Almost surely, 2^129420776 is an apocalyptic number.

It is an amenable number.

129420776 is a deficient number, since it is larger than the sum of its proper divisors (113243194).

129420776 is a wasteful number, since it uses less digits than its factorization.

129420776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16177603 (or 16177599 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 129420776 is about 11376.3252414829. The cubic root of 129420776 is about 505.8262147506.

The spelling of 129420776 in words is "one hundred twenty-nine million, four hundred twenty thousand, seven hundred seventy-six".