129147840 has 84 divisors (see below), whose sum is σ = 444224664. Its totient is φ = 34438656.

The previous prime is 129147833. The next prime is 129147847. The reversal of 129147840 is 48741921.

It is an interprime number because it is at equal distance from previous prime (129147833) and next prime (129147847).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129147795 and 129147804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129147847) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 19542 + ... + 25301.

Almost surely, 2^129147840 is an apocalyptic number.

129147840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129147840 is an abundant number, since it is smaller than the sum of its proper divisors (315076824).

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

129147840 is a wasteful number, since it uses less digits than its factorization.

129147840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44866 (or 44853 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 129147840 is about 11364.3231210662. The cubic root of 129147840 is about 505.4703848435.

The spelling of 129147840 in words is "one hundred twenty-nine million, one hundred forty-seven thousand, eight hundred forty".