129038620 has 12 divisors (see below), whose sum is σ = 270981144. Its totient is φ = 51615440.

The previous prime is 129038617. The next prime is 129038621. The reversal of 129038620 is 26830921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129038621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3225946 + ... + 3225985.

It is an arithmetic number, because the mean of its divisors is an integer number (22581762).

Almost surely, 2^129038620 is an apocalyptic number.

129038620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129038620 is an abundant number, since it is smaller than the sum of its proper divisors (141942524).

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

129038620 is a wasteful number, since it uses less digits than its factorization.

129038620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6451940 (or 6451938 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 129038620 is about 11359.5167150720. The cubic root of 129038620 is about 505.3278529831.

The spelling of 129038620 in words is "one hundred twenty-nine million, thirty-eight thousand, six hundred twenty".