823730197 has 4 divisors (see below), whose sum is σ = 823899276. Its totient is φ = 823561120.

The previous prime is 823730183. The next prime is 823730203. The reversal of 823730197 is 791037328.

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 781817521 + 41912676 = 27961^2 + 6474^2 .

It is a cyclic number.

It is not a de Polignac number, because 823730197 - 2⁷ = 823730069 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 (823730147) 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, 77008 + ... + 87049.

It is an arithmetic number, because the mean of its divisors is an integer number (205974819).

Almost surely, 2^823730197 is an apocalyptic number.

It is an amenable number.

823730197 is a deficient number, since it is larger than the sum of its proper divisors (169079).

823730197 is a wasteful number, since it uses less digits than its factorization.

823730197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169078.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 823730197 is about 28700.7002876236. The cubic root of 823730197 is about 937.4072951769.

The spelling of 823730197 in words is "eight hundred twenty-three million, seven hundred thirty thousand, one hundred ninety-seven".