386681689 has 4 divisors (see below), whose sum is σ = 387209956. Its totient is φ = 386153424.

The previous prime is 386681683. The next prime is 386681699. The reversal of 386681689 is 986186683.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986186683 = 317 ⋅3110999.

It can be written as a sum of positive squares in 2 ways, for example, as 288830025 + 97851664 = 16995^2 + 9892^2 .

It is a cyclic number.

It is not a de Polignac number, because 386681689 - 2¹⁷ = 386550617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (386681683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263034 + ... + 264499.

It is an arithmetic number, because the mean of its divisors is an integer number (96802489).

Almost surely, 2^386681689 is an apocalyptic number.

It is an amenable number.

386681689 is a deficient number, since it is larger than the sum of its proper divisors (528267).

386681689 is an equidigital number, since it uses as much as digits as its factorization.

386681689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528266.

The product of its digits is 2985984, while the sum is 55.

The square root of 386681689 is about 19664.2235798925. The cubic root of 386681689 is about 728.5363109472.

The spelling of 386681689 in words is "three hundred eighty-six million, six hundred eighty-one thousand, six hundred eighty-nine".