390197257 has 2 divisors, whose sum is σ = 390197258. Its totient is φ = 390197256.

The previous prime is 390197207. The next prime is 390197261. The reversal of 390197257 is 752791093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246772681 + 143424576 = 15709^2 + 11976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390197257 is a prime.

It is not a weakly prime, because it can be changed into another prime (390197207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195098628 + 195098629.

It is an arithmetic number, because the mean of its divisors is an integer number (195098629).

Almost surely, 2^390197257 is an apocalyptic number.

It is an amenable number.

390197257 is a deficient number, since it is larger than the sum of its proper divisors (1).

390197257 is an equidigital number, since it uses as much as digits as its factorization.

390197257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 390197257 is about 19753.4112750178. The cubic root of 390197257 is about 730.7375151031.

The spelling of 390197257 in words is "three hundred ninety million, one hundred ninety-seven thousand, two hundred fifty-seven".