129542340 has 96 divisors (see below), whose sum is σ = 376233984. Its totient is φ = 33281920.

The previous prime is 129542339. The next prime is 129542353. The reversal of 129542340 is 43245921.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 129542298 and 129542307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199897 + ... + 200543.

It is an arithmetic number, because the mean of its divisors is an integer number (3919104).

Almost surely, 2^129542340 is an apocalyptic number.

129542340 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 129542340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188116992).

129542340 is an abundant number, since it is smaller than the sum of its proper divisors (246691644).

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

129542340 is a wasteful number, since it uses less digits than its factorization.

129542340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 129542340 is about 11381.6668375067. Note that the first 3 decimals coincide. The cubic root of 129542340 is about 505.9845381601.

The spelling of 129542340 in words is "one hundred twenty-nine million, five hundred forty-two thousand, three hundred forty".