386665691 has 2 divisors, whose sum is σ = 386665692. Its totient is φ = 386665690.

The previous prime is 386665681. The next prime is 386665703. The reversal of 386665691 is 196566683.

It is a weak prime.

It is an emirp because it is prime and its reverse (196566683) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-386665691 is a prime.

It is not a weakly prime, because it can be changed into another prime (386665681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193332845 + 193332846.

It is an arithmetic number, because the mean of its divisors is an integer number (193332846).

Almost surely, 2^386665691 is an apocalyptic number.

386665691 is a deficient number, since it is larger than the sum of its proper divisors (1).

386665691 is an equidigital number, since it uses as much as digits as its factorization.

386665691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 50.

The square root of 386665691 is about 19663.8167963394. The cubic root of 386665691 is about 728.5262636783.

The spelling of 386665691 in words is "three hundred eighty-six million, six hundred sixty-five thousand, six hundred ninety-one".