397769993 has 2 divisors, whose sum is σ = 397769994. Its totient is φ = 397769992.

The previous prime is 397769963. The next prime is 397770001. The reversal of 397769993 is 399967793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397125184 + 644809 = 19928^2 + 803^2 .

It is an emirp because it is prime and its reverse (399967793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397769993 is a prime.

It is not a weakly prime, because it can be changed into another prime (397769963) 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, 198884996 + 198884997.

It is an arithmetic number, because the mean of its divisors is an integer number (198884997).

Almost surely, 2^397769993 is an apocalyptic number.

It is an amenable number.

397769993 is a deficient number, since it is larger than the sum of its proper divisors (1).

397769993 is an equidigital number, since it uses as much as digits as its factorization.

397769993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17360406, while the sum is 62.

The square root of 397769993 is about 19944.1719055969. The cubic root of 397769993 is about 735.4345113078.

The spelling of 397769993 in words is "three hundred ninety-seven million, seven hundred sixty-nine thousand, nine hundred ninety-three".