386781649 has 2 divisors, whose sum is σ = 386781650. Its totient is φ = 386781648.

The previous prime is 386781611. The next prime is 386781677. The reversal of 386781649 is 946187683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375119424 + 11662225 = 19368^2 + 3415^2 .

It is a cyclic number.

It is not a de Polignac number, because 386781649 - 2⁹ = 386781137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 386781596 and 386781605.

It is not a weakly prime, because it can be changed into another prime (386781679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193390824 + 193390825.

It is an arithmetic number, because the mean of its divisors is an integer number (193390825).

Almost surely, 2^386781649 is an apocalyptic number.

It is an amenable number.

386781649 is a deficient number, since it is larger than the sum of its proper divisors (1).

386781649 is an equidigital number, since it uses as much as digits as its factorization.

386781649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The square root of 386781649 is about 19666.7650873244. The cubic root of 386781649 is about 728.5990828320.

The spelling of 386781649 in words is "three hundred eighty-six million, seven hundred eighty-one thousand, six hundred forty-nine".