386815361 has 4 divisors (see below), whose sum is σ = 396249924. Its totient is φ = 377380800.

The previous prime is 386815349. The next prime is 386815381. The reversal of 386815361 is 163518683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163518683 = 3709 ⋅44087.

It can be written as a sum of positive squares in 2 ways, for example, as 155775361 + 231040000 = 12481^2 + 15200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-386815361 is a prime.

It is a super-2 number, since 2×386815361² = 299252247011120642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 9434521 = 386815361 / (3 + 8 + 6 + 8 + 1 + 5 + 3 + 6 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (386815381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4717220 + ... + 4717301.

It is an arithmetic number, because the mean of its divisors is an integer number (99062481).

Almost surely, 2^386815361 is an apocalyptic number.

It is an amenable number.

386815361 is a deficient number, since it is larger than the sum of its proper divisors (9434563).

386815361 is an equidigital number, since it uses as much as digits as its factorization.

386815361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434562.

The product of its digits is 103680, while the sum is 41.

The square root of 386815361 is about 19667.6221491059. The cubic root of 386815361 is about 728.6202505190.

The spelling of 386815361 in words is "three hundred eighty-six million, eight hundred fifteen thousand, three hundred sixty-one".