397666793 has 2 divisors, whose sum is σ = 397666794. Its totient is φ = 397666792.

The previous prime is 397666777. The next prime is 397666807.

It is a happy number.

397666793 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379587289 + 18079504 = 19483^2 + 4252^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 397666793 - 2⁴ = 397666777 is a prime.

It is not a weakly prime, because it can be changed into another prime (397666693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198833396 + 198833397.

It is an arithmetic number, because the mean of its divisors is an integer number (198833397).

Almost surely, 2^397666793 is an apocalyptic number.

It is an amenable number.

397666793 is a deficient number, since it is larger than the sum of its proper divisors (1).

397666793 is an equidigital number, since it uses as much as digits as its factorization.

397666793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7715736, while the sum is 56.

The square root of 397666793 is about 19941.5845157801. The cubic root of 397666793 is about 735.3709038566.

The spelling of 397666793 in words is "three hundred ninety-seven million, six hundred sixty-six thousand, seven hundred ninety-three".