129617540 has 48 divisors (see below), whose sum is σ = 299400192. Its totient is φ = 46836096.

The previous prime is 129617533. The next prime is 129617561. The reversal of 129617540 is 45716921.

It is a self number, because there is not a number n which added to its sum of digits gives 129617540.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6917 + ... + 17523.

It is an arithmetic number, because the mean of its divisors is an integer number (6237504).

Almost surely, 2^129617540 is an apocalyptic number.

129617540 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 129617540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149700096).

129617540 is an abundant number, since it is smaller than the sum of its proper divisors (169782652).

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

129617540 is a wasteful number, since it uses less digits than its factorization.

129617540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10676 (or 10674 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 129617540 is about 11384.9699165171. The cubic root of 129617540 is about 506.0824281033.

The spelling of 129617540 in words is "one hundred twenty-nine million, six hundred seventeen thousand, five hundred forty".