129121926 has 12 divisors (see below), whose sum is σ = 258299532. Its totient is φ = 43031364.

The previous prime is 129121907. The next prime is 129121957. The reversal of 129121926 is 629121921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25515 + ... + 30153.

It is an arithmetic number, because the mean of its divisors is an integer number (21524961).

Almost surely, 2^129121926 is an apocalyptic number.

129121926 is an abundant number, since it is smaller than the sum of its proper divisors (129177606).

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

129121926 is an frugal number, since it uses more digits than its factorization.

129121926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283 (or 4644 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 129121926 is about 11363.1829167712. The cubic root of 129121926 is about 505.4365744038.

The spelling of 129121926 in words is "one hundred twenty-nine million, one hundred twenty-one thousand, nine hundred twenty-six".