129811844 has 12 divisors (see below), whose sum is σ = 227535168. Its totient is φ = 64801800.

The previous prime is 129811841. The next prime is 129811909. The reversal of 129811844 is 448118921.

It is a super-2 number, since 2×129811844² = 33702229685360672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129811798 and 129811807.

It is not an unprimeable number, because it can be changed into a prime (129811841) 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, 23192 + ... + 28239.

It is an arithmetic number, because the mean of its divisors is an integer number (18961264).

Almost surely, 2^129811844 is an apocalyptic number.

It is an amenable number.

129811844 is a deficient number, since it is larger than the sum of its proper divisors (97723324).

129811844 is a wasteful number, since it uses less digits than its factorization.

129811844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52066 (or 52064 counting only the distinct ones).

The product of its digits is 18432, while the sum is 38.

The square root of 129811844 is about 11393.5000767982. The cubic root of 129811844 is about 506.3351838774.

The spelling of 129811844 in words is "one hundred twenty-nine million, eight hundred eleven thousand, eight hundred forty-four".