194778965 has 8 divisors (see below), whose sum is σ = 236937048. Its totient is φ = 153688320.

The previous prime is 194778959. The next prime is 194778971. The reversal of 194778965 is 569877491.

It is an interprime number because it is at equal distance from previous prime (194778959) and next prime (194778971).

It can be written as a sum of positive squares in 4 ways, for example, as 41242084 + 153536881 = 6422^2 + 12391^2 .

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

It is not a de Polignac number, because 194778965 - 2⁶ = 194778901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194778965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266456 + ... + 267185.

It is an arithmetic number, because the mean of its divisors is an integer number (29617131).

Almost surely, 2^194778965 is an apocalyptic number.

It is an amenable number.

194778965 is a deficient number, since it is larger than the sum of its proper divisors (42158083).

194778965 is an equidigital number, since it uses as much as digits as its factorization.

194778965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533719.

The product of its digits is 3810240, while the sum is 56.

The square root of 194778965 is about 13956.3234771913. The cubic root of 194778965 is about 579.6698130551.

The spelling of 194778965 in words is "one hundred ninety-four million, seven hundred seventy-eight thousand, nine hundred sixty-five".