194166397 has 4 divisors (see below), whose sum is σ = 200861820. Its totient is φ = 187470976.

The previous prime is 194166383. The next prime is 194166409. The reversal of 194166397 is 793661491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793661491 = 7 ⋅113380213.

It can be written as a sum of positive squares in 2 ways, for example, as 106069401 + 88096996 = 10299^2 + 9386^2 .

It is a cyclic number.

It is not a de Polignac number, because 194166397 - 2¹¹ = 194164349 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 (194166307) 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, 3347668 + ... + 3347725.

It is an arithmetic number, because the mean of its divisors is an integer number (50215455).

Almost surely, 2^194166397 is an apocalyptic number.

It is an amenable number.

194166397 is a deficient number, since it is larger than the sum of its proper divisors (6695423).

194166397 is an equidigital number, since it uses as much as digits as its factorization.

194166397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6695422.

The product of its digits is 244944, while the sum is 46.

The square root of 194166397 is about 13934.3603010687. The cubic root of 194166397 is about 579.0614994687.

The spelling of 194166397 in words is "one hundred ninety-four million, one hundred sixty-six thousand, three hundred ninety-seven".