129550540 has 96 divisors (see below), whose sum is σ = 340744320. Its totient is φ = 40341504.

The previous prime is 129550517. The next prime is 129550573. The reversal of 129550540 is 45055921.

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, 68082 + ... + 69958.

It is an arithmetic number, because the mean of its divisors is an integer number (3549420).

Almost surely, 2^129550540 is an apocalyptic number.

129550540 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 129550540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170372160).

129550540 is an abundant number, since it is smaller than the sum of its proper divisors (211193780).

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

129550540 is a wasteful number, since it uses less digits than its factorization.

129550540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939 (or 1937 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 129550540 is about 11382.0270602384. The cubic root of 129550540 is about 505.9952141694.

The spelling of 129550540 in words is "one hundred twenty-nine million, five hundred fifty thousand, five hundred forty".