129911810 has 32 divisors (see below), whose sum is σ = 274475520. Its totient is φ = 43336512.

The previous prime is 129911801. The next prime is 129911833. The reversal of 129911810 is 18119921.

It is a super-2 number, since 2×129911810² = 33754156754952200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22490 + ... + 27669.

It is an arithmetic number, because the mean of its divisors is an integer number (8577360).

Almost surely, 2^129911810 is an apocalyptic number.

129911810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129911810 is an abundant number, since it is smaller than the sum of its proper divisors (144563710).

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

129911810 is a wasteful number, since it uses less digits than its factorization.

129911810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50210.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 129911810 is about 11397.8862075387. The cubic root of 129911810 is about 506.4651240381.

The spelling of 129911810 in words is "one hundred twenty-nine million, nine hundred eleven thousand, eight hundred ten".