397686768843 has 54 divisors (see below), whose sum is σ = 668084813172. Its totient is φ = 209716416000.

The previous prime is 397686768827. The next prime is 397686768877. The reversal of 397686768843 is 348867686793.

It is not a de Polignac number, because 397686768843 - 2⁴ = 397686768827 is a prime.

It is a super-2 number, since 2×397686768843² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397686768803) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 99394843 + ... + 99398843.

Almost surely, 2^397686768843 is an apocalyptic number.

397686768843 is a deficient number, since it is larger than the sum of its proper divisors (270398044329).

397686768843 is an frugal number, since it uses more digits than its factorization.

397686768843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8045 (or 4024 counting only the distinct ones).

The product of its digits is 1755758592, while the sum is 75.

Multiplying 397686768843 by its sum of digits (75), we get a square (29826507663225 = 5461365²).

The spelling of 397686768843 in words is "three hundred ninety-seven billion, six hundred eighty-six million, seven hundred sixty-eight thousand, eight hundred forty-three".