194378609 has 8 divisors (see below), whose sum is σ = 195584640. Its totient is φ = 193176576.

The previous prime is 194378579. The next prime is 194378669. The reversal of 194378609 is 906873491.

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 194378609 - 2²⁴ = 177601393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194378669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211052 + ... + 211970.

It is an arithmetic number, because the mean of its divisors is an integer number (24448080).

Almost surely, 2^194378609 is an apocalyptic number.

It is an amenable number.

194378609 is a deficient number, since it is larger than the sum of its proper divisors (1206031).

194378609 is an equidigital number, since it uses as much as digits as its factorization.

194378609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 194378609 is about 13941.9729235141. The cubic root of 194378609 is about 579.2723822644.

The spelling of 194378609 in words is "one hundred ninety-four million, three hundred seventy-eight thousand, six hundred nine".