19797194 has 4 divisors (see below), whose sum is σ = 29695794. Its totient is φ = 9898596.

The previous prime is 19797191. The next prime is 19797203. The reversal of 19797194 is 49179791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49179791 = 79 ⋅622529.

It can be written as a sum of positive squares in only one way, i.e., 12694969 + 7102225 = 3563^2 + 2665^2 .

It is not an unprimeable number, because it can be changed into a prime (19797191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4949297 + ... + 4949300.

Almost surely, 2^19797194 is an apocalyptic number.

19797194 is a deficient number, since it is larger than the sum of its proper divisors (9898600).

19797194 is an equidigital number, since it uses as much as digits as its factorization.

19797194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9898599.

The product of its digits is 142884, while the sum is 47.

The square root of 19797194 is about 4449.4037802834. The cubic root of 19797194 is about 270.5211425283.

It can be divided in two parts, 19797 and 194, that added together give a palindrome (19991).

The spelling of 19797194 in words is "nineteen million, seven hundred ninety-seven thousand, one hundred ninety-four".