397797643 has 2 divisors, whose sum is σ = 397797644. Its totient is φ = 397797642.

The previous prime is 397797599. The next prime is 397797649. The reversal of 397797643 is 346797793.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (346797793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397797643 - 2⁹ = 397797131 is a prime.

It is not a weakly prime, because it can be changed into another prime (397797649) 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 as a sum of consecutive naturals, namely, 198898821 + 198898822.

It is an arithmetic number, because the mean of its divisors is an integer number (198898822).

Almost surely, 2^397797643 is an apocalyptic number.

397797643 is a deficient number, since it is larger than the sum of its proper divisors (1).

397797643 is an equidigital number, since it uses as much as digits as its factorization.

397797643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6001128, while the sum is 55.

The square root of 397797643 is about 19944.8650785108. The cubic root of 397797643 is about 735.4515515517.

The spelling of 397797643 in words is "three hundred ninety-seven million, seven hundred ninety-seven thousand, six hundred forty-three".