129842440 has 64 divisors (see below), whose sum is σ = 359573760. Its totient is φ = 41091840.

The previous prime is 129842431. The next prime is 129842441. The reversal of 129842440 is 44248921.

It is a junction number, because it is equal to n+sod(n) for n = 129842396 and 129842405.

It is not an unprimeable number, because it can be changed into a prime (129842441) 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, 14196 + ... + 21475.

It is an arithmetic number, because the mean of its divisors is an integer number (5618340).

Almost surely, 2^129842440 is an apocalyptic number.

129842440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129842440 is an abundant number, since it is smaller than the sum of its proper divisors (229731320).

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

129842440 is a wasteful number, since it uses less digits than its factorization.

129842440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35702 (or 35698 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 129842440 is about 11394.8426930783. The cubic root of 129842440 is about 506.3749609729.

The spelling of 129842440 in words is "one hundred twenty-nine million, eight hundred forty-two thousand, four hundred forty".