194385209 has 4 divisors (see below), whose sum is σ = 194415504. Its totient is φ = 194354916.

The previous prime is 194385133. The next prime is 194385211. The reversal of 194385209 is 902583491.

194385209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194385209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194385239) 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, 1307 + ... + 19760.

It is an arithmetic number, because the mean of its divisors is an integer number (48603876).

Almost surely, 2^194385209 is an apocalyptic number.

It is an amenable number.

194385209 is a deficient number, since it is larger than the sum of its proper divisors (30295).

194385209 is an equidigital number, since it uses as much as digits as its factorization.

194385209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30294.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 194385209 is about 13942.2096168434. The cubic root of 194385209 is about 579.2789384633.

The spelling of 194385209 in words is "one hundred ninety-four million, three hundred eighty-five thousand, two hundred nine".