197390969 has 4 divisors (see below), whose sum is σ = 197439396. Its totient is φ = 197342544.

The previous prime is 197390957. The next prime is 197390983. The reversal of 197390969 is 969093791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 969093791 = 4409 ⋅219799.

It can be written as a sum of positive squares in 2 ways, for example, as 112105744 + 85285225 = 10588^2 + 9235^2 .

It is a cyclic number.

It is not a de Polignac number, because 197390969 - 2⁴ = 197390953 is a prime.

It is a super-2 number, since 2×197390969² = 77926389285517922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197390969.

It is not an unprimeable number, because it can be changed into a prime (197390909) 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, 17474 + ... + 26459.

It is an arithmetic number, because the mean of its divisors is an integer number (49359849).

Almost surely, 2^197390969 is an apocalyptic number.

It is an amenable number.

197390969 is a deficient number, since it is larger than the sum of its proper divisors (48427).

197390969 is an equidigital number, since it uses as much as digits as its factorization.

197390969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48426.

The product of its (nonzero) digits is 826686, while the sum is 53.

The square root of 197390969 is about 14049.5896381353. The cubic root of 197390969 is about 582.2494580957.

The spelling of 197390969 in words is "one hundred ninety-seven million, three hundred ninety thousand, nine hundred sixty-nine".