397099187 has 2 divisors, whose sum is σ = 397099188. Its totient is φ = 397099186.

The previous prime is 397099139. The next prime is 397099201. The reversal of 397099187 is 781990793.

It is a strong prime.

It is an emirp because it is prime and its reverse (781990793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397099187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397099387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198549593 + 198549594.

It is an arithmetic number, because the mean of its divisors is an integer number (198549594).

Almost surely, 2^397099187 is an apocalyptic number.

397099187 is a deficient number, since it is larger than the sum of its proper divisors (1).

397099187 is an equidigital number, since it uses as much as digits as its factorization.

397099187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 397099187 is about 19927.3477161413. The cubic root of 397099187 is about 735.0208623199.

The spelling of 397099187 in words is "three hundred ninety-seven million, ninety-nine thousand, one hundred eighty-seven".