197820243 has 12 divisors (see below), whose sum is σ = 285885600. Its totient is φ = 131813136.

The previous prime is 197820199. The next prime is 197820257. The reversal of 197820243 is 342028791.

It is not a de Polignac number, because 197820243 - 2¹² = 197816147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197820198 and 197820207.

It is not an unprimeable number, because it can be changed into a prime (197820283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18630 + ... + 27252.

It is an arithmetic number, because the mean of its divisors is an integer number (23823800).

Almost surely, 2^197820243 is an apocalyptic number.

197820243 is a deficient number, since it is larger than the sum of its proper divisors (88065357).

197820243 is a wasteful number, since it uses less digits than its factorization.

197820243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11178 (or 11175 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 197820243 is about 14064.8584422311. The cubic root of 197820243 is about 582.6712328534.

The spelling of 197820243 in words is "one hundred ninety-seven million, eight hundred twenty thousand, two hundred forty-three".