129268840 has 32 divisors (see below), whose sum is σ = 293582880. Its totient is φ = 51222592.

The previous prime is 129268817. The next prime is 129268871. The reversal of 129268840 is 48862921.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 129268793 and 129268802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10822 + ... + 19381.

It is an arithmetic number, because the mean of its divisors is an integer number (9174465).

Almost surely, 2^129268840 is an apocalyptic number.

129268840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129268840 is an abundant number, since it is smaller than the sum of its proper divisors (164314040).

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

129268840 is a wasteful number, since it uses less digits than its factorization.

129268840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30321 (or 30317 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 129268840 is about 11369.6455529625. The cubic root of 129268840 is about 505.6281957818.

The spelling of 129268840 in words is "one hundred twenty-nine million, two hundred sixty-eight thousand, eight hundred forty".