3865749409 has 2 divisors, whose sum is σ = 3865749410. Its totient is φ = 3865749408.

The previous prime is 3865749397. The next prime is 3865749427. The reversal of 3865749409 is 9049475683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3824185600 + 41563809 = 61840^2 + 6447^2 .

It is a cyclic number.

It is not a de Polignac number, because 3865749409 - 2⁷ = 3865749281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3865749409.

It is not a weakly prime, because it can be changed into another prime (3865749469) 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, 1932874704 + 1932874705.

It is an arithmetic number, because the mean of its divisors is an integer number (1932874705).

Almost surely, 2^3865749409 is an apocalyptic number.

It is an amenable number.

3865749409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3865749409 is an equidigital number, since it uses as much as digits as its factorization.

3865749409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The square root of 3865749409 is about 62175.1510573155. The cubic root of 3865749409 is about 1569.4394538301.

The spelling of 3865749409 in words is "three billion, eight hundred sixty-five million, seven hundred forty-nine thousand, four hundred nine".