386385781 has 2 divisors, whose sum is σ = 386385782. Its totient is φ = 386385780.

The previous prime is 386385743. The next prime is 386385787. The reversal of 386385781 is 187583683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293436900 + 92948881 = 17130^2 + 9641^2 .

It is a cyclic number.

It is not a de Polignac number, because 386385781 - 2¹⁵ = 386353013 is a prime.

It is a super-2 number, since 2×386385781² = 298587943517959922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (386385787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193192890 + 193192891.

It is an arithmetic number, because the mean of its divisors is an integer number (193192891).

Almost surely, 2^386385781 is an apocalyptic number.

It is an amenable number.

386385781 is a deficient number, since it is larger than the sum of its proper divisors (1).

386385781 is an equidigital number, since it uses as much as digits as its factorization.

386385781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 49.

The square root of 386385781 is about 19656.6981204881. The cubic root of 386385781 is about 728.3504261544.

The spelling of 386385781 in words is "three hundred eighty-six million, three hundred eighty-five thousand, seven hundred eighty-one".