129740 has 24 divisors (see below), whose sum is σ = 294000. Its totient is φ = 47808.

The previous prime is 129737. The next prime is 129749. The reversal of 129740 is 47921.

It is not an unprimeable number, because it can be changed into a prime (129749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11 + ... + 509.

It is an arithmetic number, because the mean of its divisors is an integer number (12250).

2¹²⁹⁷⁴⁰ is an apocalyptic number.

129740 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 129740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147000).

129740 is an abundant number, since it is smaller than the sum of its proper divisors (164260).

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

129740 is a wasteful number, since it uses less digits than its factorization.

129740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 129740 is about 360.1943919608. The cubic root of 129740 is about 50.6241756712.

The spelling of 129740 in words is "one hundred twenty-nine thousand, seven hundred forty".