386832997681 has 9 divisors (see below), whose sum is σ = 418887090219. Its totient is φ = 357069149736.

The previous prime is 386832997667. The next prime is 386832997699. The reversal of 386832997681 is 186799238683.

The square root of 386832997681 is 621959.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 57223816225 + 329609181456 = 239215^2 + 574116^2 .

It is not a de Polignac number, because 386832997681 - 2³³ = 378243063089 is a prime.

It is a super-2 number, since 2×386832997681² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 386832997681.

It is not an unprimeable number, because it can be changed into a prime (386832997631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8061546 + ... + 8109388.

Almost surely, 2^386832997681 is an apocalyptic number.

386832997681 is the 621959-th square number.

386832997681 is the 310980-th centered octagonal number.

It is an amenable number.

386832997681 is a deficient number, since it is larger than the sum of its proper divisors (32054092538).

386832997681 is an frugal number, since it uses more digits than its factorization.

386832997681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95712 (or 47856 counting only the distinct ones).

The product of its digits is 188116992, while the sum is 70.

The spelling of 386832997681 in words is "three hundred eighty-six billion, eight hundred thirty-two million, nine hundred ninety-seven thousand, six hundred eighty-one".