129121308 has 36 divisors (see below), whose sum is σ = 328565328. Its totient is φ = 42753600.

The previous prime is 129121277. The next prime is 129121309. The reversal of 129121308 is 803121921.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129121309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6441 + ... + 17312.

Almost surely, 2^129121308 is an apocalyptic number.

129121308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129121308 is an abundant number, since it is smaller than the sum of its proper divisors (199444020).

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

129121308 is a wasteful number, since it uses less digits than its factorization.

129121308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23914 (or 23909 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 129121308 is about 11363.1557236535. The cubic root of 129121308 is about 505.4357680334.

The spelling of 129121308 in words is "one hundred twenty-nine million, one hundred twenty-one thousand, three hundred eight".