194869309 has 4 divisors (see below), whose sum is σ = 197217216. Its totient is φ = 192521404.

The previous prime is 194869307. The next prime is 194869313. The reversal of 194869309 is 903968491.

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 not a de Polignac number, because 194869309 - 2¹ = 194869307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194869307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1173829 + ... + 1173994.

It is an arithmetic number, because the mean of its divisors is an integer number (49304304).

Almost surely, 2^194869309 is an apocalyptic number.

It is an amenable number.

194869309 is a deficient number, since it is larger than the sum of its proper divisors (2347907).

194869309 is an equidigital number, since it uses as much as digits as its factorization.

194869309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347906.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 194869309 is about 13959.5597709956. The cubic root of 194869309 is about 579.7594216273.

The spelling of 194869309 in words is "one hundred ninety-four million, eight hundred sixty-nine thousand, three hundred nine".