386394991 has 2 divisors, whose sum is σ = 386394992. Its totient is φ = 386394990.

The previous prime is 386394977. The next prime is 386394997. The reversal of 386394991 is 199493683.

It is a strong prime.

It is an emirp because it is prime and its reverse (199493683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 386394991 - 2²¹ = 384297839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (386394997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193197495 + 193197496.

It is an arithmetic number, because the mean of its divisors is an integer number (193197496).

Almost surely, 2^386394991 is an apocalyptic number.

386394991 is a deficient number, since it is larger than the sum of its proper divisors (1).

386394991 is an equidigital number, since it uses as much as digits as its factorization.

386394991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 52.

The square root of 386394991 is about 19656.9323903808. The cubic root of 386394991 is about 728.3562131635.

The spelling of 386394991 in words is "three hundred eighty-six million, three hundred ninety-four thousand, nine hundred ninety-one".