129857000 has 128 divisors (see below), whose sum is σ = 374250240. Its totient is φ = 41068800.

The previous prime is 129856973. The next prime is 129857003. The reversal of 129857000 is 758921.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (129857003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90287 + ... + 91713.

It is an arithmetic number, because the mean of its divisors is an integer number (2923830).

Almost surely, 2^129857000 is an apocalyptic number.

129857000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129857000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187125120).

129857000 is an abundant number, since it is smaller than the sum of its proper divisors (244393240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129857000 is a wasteful number, since it uses less digits than its factorization.

129857000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 129857000 is about 11395.4815606889. The cubic root of 129857000 is about 506.3938878709.

The spelling of 129857000 in words is "one hundred twenty-nine million, eight hundred fifty-seven thousand".