397189687 has 2 divisors, whose sum is σ = 397189688. Its totient is φ = 397189686.

The previous prime is 397189633. The next prime is 397189697. The reversal of 397189687 is 786981793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397189687 - 2¹¹ = 397187639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397189697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198594843 + 198594844.

It is an arithmetic number, because the mean of its divisors is an integer number (198594844).

Almost surely, 2^397189687 is an apocalyptic number.

397189687 is a deficient number, since it is larger than the sum of its proper divisors (1).

397189687 is an equidigital number, since it uses as much as digits as its factorization.

397189687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 58.

The square root of 397189687 is about 19929.6183355327. The cubic root of 397189687 is about 735.0766958392.

The spelling of 397189687 in words is "three hundred ninety-seven million, one hundred eighty-nine thousand, six hundred eighty-seven".