194128205 has 8 divisors (see below), whose sum is σ = 233047800. Its totient is φ = 155239936.

The previous prime is 194128183. The next prime is 194128213. The reversal of 194128205 is 502821491.

It can be written as a sum of positive squares in 4 ways, for example, as 122522761 + 71605444 = 11069^2 + 8462^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 194128205 - 2⁶ = 194128141 is a prime.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9161 + ... + 21729.

It is an arithmetic number, because the mean of its divisors is an integer number (29130975).

Almost surely, 2^194128205 is an apocalyptic number.

It is an amenable number.

194128205 is a deficient number, since it is larger than the sum of its proper divisors (38919595).

194128205 is a wasteful number, since it uses less digits than its factorization.

194128205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15663.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 194128205 is about 13932.9898083649. The cubic root of 194128205 is about 579.0235303739.

Adding to 194128205 its reverse (502821491), we get a palindrome (696949696).

The spelling of 194128205 in words is "one hundred ninety-four million, one hundred twenty-eight thousand, two hundred five".