297638641 has 4 divisors (see below), whose sum is σ = 298381284. Its totient is φ = 296896000.

The previous prime is 297638633. The next prime is 297638651. The reversal of 297638641 is 146836792.

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 170851041 + 126787600 = 13071^2 + 11260^2 .

It is a cyclic number.

It is not a de Polignac number, because 297638641 - 2³ = 297638633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 297638591 and 297638600.

It is not an unprimeable number, because it can be changed into a prime (297638611) 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, 370720 + ... + 371521.

It is an arithmetic number, because the mean of its divisors is an integer number (74595321).

Almost surely, 2^297638641 is an apocalyptic number.

It is an amenable number.

297638641 is a deficient number, since it is larger than the sum of its proper divisors (742643).

297638641 is an equidigital number, since it uses as much as digits as its factorization.

297638641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742642.

The product of its digits is 435456, while the sum is 46.

The square root of 297638641 is about 17252.2068443431. The cubic root of 297638641 is about 667.6719086654.

The spelling of 297638641 in words is "two hundred ninety-seven million, six hundred thirty-eight thousand, six hundred forty-one".