397287863 has 4 divisors (see below), whose sum is σ = 454043280. Its totient is φ = 340532448.

The previous prime is 397287859. The next prime is 397287889. The reversal of 397287863 is 368782793.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 397287863 - 2² = 397287859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397287893) 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 in 3 ways as a sum of consecutive naturals, for example, 28377698 + ... + 28377711.

It is an arithmetic number, because the mean of its divisors is an integer number (113510820).

Almost surely, 2^397287863 is an apocalyptic number.

397287863 is a deficient number, since it is larger than the sum of its proper divisors (56755417).

397287863 is an equidigital number, since it uses as much as digits as its factorization.

397287863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56755416.

The product of its digits is 3048192, while the sum is 53.

The square root of 397287863 is about 19932.0812510887. The cubic root of 397287863 is about 735.1372554382.

The spelling of 397287863 in words is "three hundred ninety-seven million, two hundred eighty-seven thousand, eight hundred sixty-three".