129578977 has 8 divisors (see below), whose sum is σ = 145919232. Its totient is φ = 113998800.

The previous prime is 129578929. The next prime is 129579013. The reversal of 129578977 is 779875921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129578977 - 2²³ = 121190369 is a prime.

It is a super-2 number, since 2×129578977² = 33581422560733058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129578677) 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 in 7 ways as a sum of consecutive naturals, for example, 189658 + ... + 190339.

It is an arithmetic number, because the mean of its divisors is an integer number (18239904).

Almost surely, 2^129578977 is an apocalyptic number.

It is an amenable number.

129578977 is a deficient number, since it is larger than the sum of its proper divisors (16340255).

129578977 is a wasteful number, since it uses less digits than its factorization.

129578977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380039.

The product of its digits is 2222640, while the sum is 55.

The square root of 129578977 is about 11383.2761980020. The cubic root of 129578977 is about 506.0322342987.

The spelling of 129578977 in words is "one hundred twenty-nine million, five hundred seventy-eight thousand, nine hundred seventy-seven".