129844857 has 8 divisors (see below), whose sum is σ = 173391040. Its totient is φ = 86430960.

The previous prime is 129844853. The next prime is 129844873. The reversal of 129844857 is 758448921.

It is a happy number.

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

It is not a de Polignac number, because 129844857 - 2² = 129844853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129844853) 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, 30757 + ... + 34722.

It is an arithmetic number, because the mean of its divisors is an integer number (21673880).

Almost surely, 2^129844857 is an apocalyptic number.

It is an amenable number.

129844857 is a deficient number, since it is larger than the sum of its proper divisors (43546183).

129844857 is an equidigital number, since it uses as much as digits as its factorization.

129844857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66143.

The product of its digits is 645120, while the sum is 48.

The square root of 129844857 is about 11394.9487493363. The cubic root of 129844857 is about 506.3781029879.

The spelling of 129844857 in words is "one hundred twenty-nine million, eight hundred forty-four thousand, eight hundred fifty-seven".