2185404129 has 12 divisors (see below), whose sum is σ = 3158259156. Its totient is φ = 1456214112.

The previous prime is 2185404121. The next prime is 2185404157. The reversal of 2185404129 is 9214045812.

It can be written as a sum of positive squares in 2 ways, for example, as 691427025 + 1493977104 = 26295^2 + 38652^2 .

It is not a de Polignac number, because 2185404129 - 2³ = 2185404121 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2185404093 and 2185404102.

It is not an unprimeable number, because it can be changed into a prime (2185404121) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 40662 + ... + 77615.

It is an arithmetic number, because the mean of its divisors is an integer number (263188263).

Almost surely, 2^2185404129 is an apocalyptic number.

It is an amenable number.

2185404129 is a deficient number, since it is larger than the sum of its proper divisors (972855027).

2185404129 is a wasteful number, since it uses less digits than its factorization.

2185404129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120336 (or 120333 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 2185404129 is about 46748.3061618279. The cubic root of 2185404129 is about 1297.7088102131.

The spelling of 2185404129 in words is "two billion, one hundred eighty-five million, four hundred four thousand, one hundred twenty-nine".