129009477 has 8 divisors (see below), whose sum is σ = 172225440. Its totient is φ = 85899920.

The previous prime is 129009437. The next prime is 129009479. The reversal of 129009477 is 774900921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129009477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129009479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23727 + ... + 28652.

It is an arithmetic number, because the mean of its divisors is an integer number (21528180).

Almost surely, 2^129009477 is an apocalyptic number.

It is an amenable number.

129009477 is a deficient number, since it is larger than the sum of its proper divisors (43215963).

129009477 is an equidigital number, since it uses as much as digits as its factorization.

129009477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53203.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 129009477 is about 11358.2338856003. The cubic root of 129009477 is about 505.2898078397.

The spelling of 129009477 in words is "one hundred twenty-nine million, nine thousand, four hundred seventy-seven".