129384857 has 8 divisors (see below), whose sum is σ = 149740800. Its totient is φ = 109497024.

The previous prime is 129384847. The next prime is 129384869. The reversal of 129384857 is 758483921.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-129384857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129384847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116432 + ... + 117537.

It is an arithmetic number, because the mean of its divisors is an integer number (18717600).

Almost surely, 2^129384857 is an apocalyptic number.

It is an amenable number.

129384857 is a deficient number, since it is larger than the sum of its proper divisors (20355943).

129384857 is an equidigital number, since it uses as much as digits as its factorization.

129384857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234055.

The product of its digits is 483840, while the sum is 47.

The square root of 129384857 is about 11374.7464587128. The cubic root of 129384857 is about 505.7794153277.

The spelling of 129384857 in words is "one hundred twenty-nine million, three hundred eighty-four thousand, eight hundred fifty-seven".