397039187 has 2 divisors, whose sum is σ = 397039188. Its totient is φ = 397039186.

The previous prime is 397039177. The next prime is 397039207. The reversal of 397039187 is 781930793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 397039187 - 2¹⁰ = 397038163 is a prime.

It is not a weakly prime, because it can be changed into another prime (397039177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198519593 + 198519594.

It is an arithmetic number, because the mean of its divisors is an integer number (198519594).

Almost surely, 2^397039187 is an apocalyptic number.

397039187 is a deficient number, since it is larger than the sum of its proper divisors (1).

397039187 is an equidigital number, since it uses as much as digits as its factorization.

397039187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 397039187 is about 19925.8421904822. The cubic root of 397039187 is about 734.9838409454.

The spelling of 397039187 in words is "three hundred ninety-seven million, thirty-nine thousand, one hundred eighty-seven".