129801905 has 8 divisors (see below), whose sum is σ = 155832000. Its totient is φ = 103795056.

The previous prime is 129801899. The next prime is 129801911. The reversal of 129801905 is 509108921.

It is an interprime number because it is at equal distance from previous prime (129801899) and next prime (129801911).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129801905 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10796 + ... + 19394.

It is an arithmetic number, because the mean of its divisors is an integer number (19479000).

Almost surely, 2^129801905 is an apocalyptic number.

It is an amenable number.

129801905 is a deficient number, since it is larger than the sum of its proper divisors (26030095).

129801905 is an equidigital number, since it uses as much as digits as its factorization.

129801905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11623.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 129801905 is about 11393.0638987061. The cubic root of 129801905 is about 506.3222610868.

The spelling of 129801905 in words is "one hundred twenty-nine million, eight hundred one thousand, nine hundred five".