129810822 has 8 divisors (see below), whose sum is σ = 259621656. Its totient is φ = 43270272.

The previous prime is 129810817. The next prime is 129810823. The reversal of 129810822 is 228018921.

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

129810822 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129810823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10817563 + ... + 10817574.

It is an arithmetic number, because the mean of its divisors is an integer number (32452707).

Almost surely, 2^129810822 is an apocalyptic number.

129810822 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129810822 is a wasteful number, since it uses less digits than its factorization.

129810822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21635142.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 129810822 is about 11393.4552265764. The cubic root of 129810822 is about 506.3338550929. Note that the first 3 decimals are identical.

The spelling of 129810822 in words is "one hundred twenty-nine million, eight hundred ten thousand, eight hundred twenty-two".