194243797 has 4 divisors (see below), whose sum is σ = 211902336. Its totient is φ = 176585260.

The previous prime is 194243789. The next prime is 194243807. The reversal of 194243797 is 797342491.

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, and also an emirpimes, since its reverse is a distinct semiprime: 797342491 = 11 ⋅72485681.

It is a cyclic number.

It is not a de Polignac number, because 194243797 - 2³ = 194243789 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 (194243297) 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, 8829253 + ... + 8829274.

It is an arithmetic number, because the mean of its divisors is an integer number (52975584).

Almost surely, 2^194243797 is an apocalyptic number.

It is an amenable number.

194243797 is a deficient number, since it is larger than the sum of its proper divisors (17658539).

194243797 is a wasteful number, since it uses less digits than its factorization.

194243797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17658538.

The product of its digits is 381024, while the sum is 46.

The square root of 194243797 is about 13937.1373316044. The cubic root of 194243797 is about 579.1384324613.

The spelling of 194243797 in words is "one hundred ninety-four million, two hundred forty-three thousand, seven hundred ninety-seven".