129361540 has 96 divisors (see below), whose sum is σ = 341397504. Its totient is φ = 39999360.

The previous prime is 129361513. The next prime is 129361553. The reversal of 129361540 is 45163921.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256929 + ... + 257431.

It is an arithmetic number, because the mean of its divisors is an integer number (3556224).

Almost surely, 2^129361540 is an apocalyptic number.

129361540 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 129361540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170698752).

129361540 is an abundant number, since it is smaller than the sum of its proper divisors (212035964).

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

129361540 is a wasteful number, since it uses less digits than its factorization.

129361540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697 (or 695 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 129361540 is about 11373.7214666089. The cubic root of 129361540 is about 505.7490306098.

The spelling of 129361540 in words is "one hundred twenty-nine million, three hundred sixty-one thousand, five hundred forty".