397078961 has 2 divisors, whose sum is σ = 397078962. Its totient is φ = 397078960.

The previous prime is 397078943. The next prime is 397079029. The reversal of 397078961 is 169870793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263445361 + 133633600 = 16231^2 + 11560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397078961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397078861) 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, 198539480 + 198539481.

It is an arithmetic number, because the mean of its divisors is an integer number (198539481).

Almost surely, 2^397078961 is an apocalyptic number.

It is an amenable number.

397078961 is a deficient number, since it is larger than the sum of its proper divisors (1).

397078961 is an equidigital number, since it uses as much as digits as its factorization.

397078961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 397078961 is about 19926.8402161507. The cubic root of 397078961 is about 735.0083828313.

The spelling of 397078961 in words is "three hundred ninety-seven million, seventy-eight thousand, nine hundred sixty-one".