129540124 has 48 divisors (see below), whose sum is σ = 266112000. Its totient is φ = 55152048.

The previous prime is 129540121. The next prime is 129540133. The reversal of 129540124 is 421045921.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 129540092 and 129540101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129540121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360657 + ... + 361015.

It is an arithmetic number, because the mean of its divisors is an integer number (5544000).

Almost surely, 2^129540124 is an apocalyptic number.

129540124 is a gapful number since it is divisible by the number (14) 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 129540124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133056000).

129540124 is an abundant number, since it is smaller than the sum of its proper divisors (136571876).

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

129540124 is a wasteful number, since it uses less digits than its factorization.

129540124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 129540124 is about 11381.5694875531. The cubic root of 129540124 is about 505.9816529564.

The spelling of 129540124 in words is "one hundred twenty-nine million, five hundred forty thousand, one hundred twenty-four".