129245040 has 120 divisors (see below), whose sum is σ = 440172720. Its totient is φ = 33979392.

The previous prime is 129245029. The next prime is 129245059. The reversal of 129245040 is 40542921.

It is a tau number, because it is divible by the number of its divisors (120).

It is a junction number, because it is equal to n+sod(n) for n = 129244995 and 129245013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51331 + ... + 53789.

It is an arithmetic number, because the mean of its divisors is an integer number (3668106).

Almost surely, 2^129245040 is an apocalyptic number.

129245040 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 129245040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220086360).

129245040 is an abundant number, since it is smaller than the sum of its proper divisors (310927680).

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

129245040 is a wasteful number, since it uses less digits than its factorization.

129245040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551 (or 2542 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 129245040 is about 11368.5988582587. The cubic root of 129245040 is about 505.5971630656.

Adding to 129245040 its reverse (40542921), we get a palindrome (169787961).

The spelling of 129245040 in words is "one hundred twenty-nine million, two hundred forty-five thousand, forty".