397678613 has 2 divisors, whose sum is σ = 397678614. Its totient is φ = 397678612.

The previous prime is 397678559. The next prime is 397678621. The reversal of 397678613 is 316876793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306705169 + 90973444 = 17513^2 + 9538^2 .

It is an emirp because it is prime and its reverse (316876793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397678613 - 2⁸ = 397678357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397678643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198839306 + 198839307.

It is an arithmetic number, because the mean of its divisors is an integer number (198839307).

Almost surely, 2^397678613 is an apocalyptic number.

It is an amenable number.

397678613 is a deficient number, since it is larger than the sum of its proper divisors (1).

397678613 is an equidigital number, since it uses as much as digits as its factorization.

397678613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 50.

The square root of 397678613 is about 19941.8808791949. The cubic root of 397678613 is about 735.3781896866.

The spelling of 397678613 in words is "three hundred ninety-seven million, six hundred seventy-eight thousand, six hundred thirteen".