386640757 has 2 divisors, whose sum is σ = 386640758. Its totient is φ = 386640756.

The previous prime is 386640721. The next prime is 386640763. The reversal of 386640757 is 757046683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269156836 + 117483921 = 16406^2 + 10839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-386640757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (386640857) 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, 193320378 + 193320379.

It is an arithmetic number, because the mean of its divisors is an integer number (193320379).

Almost surely, 2^386640757 is an apocalyptic number.

It is an amenable number.

386640757 is a deficient number, since it is larger than the sum of its proper divisors (1).

386640757 is an equidigital number, since it uses as much as digits as its factorization.

386640757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 46.

The square root of 386640757 is about 19663.1827789908. The cubic root of 386640757 is about 728.5106037558.

The spelling of 386640757 in words is "three hundred eighty-six million, six hundred forty thousand, seven hundred fifty-seven".