397768985 has 4 divisors (see below), whose sum is σ = 477322788. Its totient is φ = 318215184.

The previous prime is 397768939. The next prime is 397768991. The reversal of 397768985 is 589867793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589867793 = 53 ⋅11129581.

It can be written as a sum of positive squares in 2 ways, for example, as 228040201 + 169728784 = 15101^2 + 13028^2 .

It is a cyclic number.

It is not a de Polignac number, because 397768985 - 2¹⁰ = 397767961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 39776894 + ... + 39776903.

It is an arithmetic number, because the mean of its divisors is an integer number (119330697).

Almost surely, 2^397768985 is an apocalyptic number.

It is an amenable number.

397768985 is a deficient number, since it is larger than the sum of its proper divisors (79553803).

397768985 is an equidigital number, since it uses as much as digits as its factorization.

397768985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79553802.

The product of its digits is 22861440, while the sum is 62.

The square root of 397768985 is about 19944.1466350406. The cubic root of 397768985 is about 735.4338900789.

The spelling of 397768985 in words is "three hundred ninety-seven million, seven hundred sixty-eight thousand, nine hundred eighty-five".