19730197 has 4 divisors (see below), whose sum is σ = 19832620. Its totient is φ = 19627776.

The previous prime is 19730173. The next prime is 19730209. The reversal of 19730197 is 79103791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8346321 + 11383876 = 2889^2 + 3374^2 .

It is a cyclic number.

It is not a de Polignac number, because 19730197 - 2⁷ = 19730069 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 (19730107) 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, 50922 + ... + 51307.

It is an arithmetic number, because the mean of its divisors is an integer number (4958155).

Almost surely, 2^19730197 is an apocalyptic number.

It is an amenable number.

19730197 is a deficient number, since it is larger than the sum of its proper divisors (102423).

19730197 is a wasteful number, since it uses less digits than its factorization.

19730197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102422.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 19730197 is about 4441.8686383098. The cubic root of 19730197 is about 270.2156347796.

The spelling of 19730197 in words is "nineteen million, seven hundred thirty thousand, one hundred ninety-seven".