129240860 has 96 divisors (see below), whose sum is σ = 324538368. Its totient is φ = 42301440.

The previous prime is 129240833. The next prime is 129240863. The reversal of 129240860 is 68042921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129240863) 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, 420827 + ... + 421133.

It is an arithmetic number, because the mean of its divisors is an integer number (3380608).

Almost surely, 2^129240860 is an apocalyptic number.

129240860 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 129240860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162269184).

129240860 is an abundant number, since it is smaller than the sum of its proper divisors (195297508).

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

129240860 is a wasteful number, since it uses less digits than its factorization.

129240860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 129240860 is about 11368.4150170549. The cubic root of 129240860 is about 505.5917123885.

The spelling of 129240860 in words is "one hundred twenty-nine million, two hundred forty thousand, eight hundred sixty".