194709009 has 16 divisors (see below), whose sum is σ = 286801920. Its totient is φ = 116510160.

The previous prime is 194708999. The next prime is 194709019. The reversal of 194709009 is 900907491.

It is an interprime number because it is at equal distance from previous prime (194708999) and next prime (194709019).

It is not a de Polignac number, because 194709009 - 2⁴ = 194708993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (194709019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34737 + ... + 39950.

It is an arithmetic number, because the mean of its divisors is an integer number (17925120).

Almost surely, 2^194709009 is an apocalyptic number.

It is an amenable number.

194709009 is a deficient number, since it is larger than the sum of its proper divisors (92092911).

194709009 is a wasteful number, since it uses less digits than its factorization.

194709009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74780.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 194709009 is about 13953.8170046765. The cubic root of 194709009 is about 579.6004074819.

The spelling of 194709009 in words is "one hundred ninety-four million, seven hundred nine thousand, nine".