129100340 has 12 divisors (see below), whose sum is σ = 271110756. Its totient is φ = 51640128.

The previous prime is 129100333. The next prime is 129100379. The reversal of 129100340 is 43001921.

It can be written as a sum of positive squares in 2 ways, for example, as 26604964 + 102495376 = 5158^2 + 10124^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6455017 = 129100340 / (1 + 2 + 9 + 1 + 0 + 0 + 3 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3227489 + ... + 3227528.

It is an arithmetic number, because the mean of its divisors is an integer number (22592563).

Almost surely, 2^129100340 is an apocalyptic number.

129100340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129100340 is an abundant number, since it is smaller than the sum of its proper divisors (142010416).

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

129100340 is a wasteful number, since it uses less digits than its factorization.

129100340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6455026 (or 6455024 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 129100340 is about 11362.2330551701. The cubic root of 129100340 is about 505.4084073262.

The spelling of 129100340 in words is "one hundred twenty-nine million, one hundred thousand, three hundred forty".