1385808649 has 4 divisors (see below), whose sum is σ = 1411956036. Its totient is φ = 1359661264.

The previous prime is 1385808631. The next prime is 1385808689. The reversal of 1385808649 is 9468085831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9468085831 = 1193 ⋅7936367.

It can be written as a sum of positive squares in 2 ways, for example, as 1021953024 + 363855625 = 31968^2 + 19075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385808649 - 2⁵ = 1385808617 is a prime.

It is a super-2 number, since 2×1385808649² = 3840931223286410402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1385808596 and 1385808605.

It is not an unprimeable number, because it can be changed into a prime (1385808689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13073614 + ... + 13073719.

It is an arithmetic number, because the mean of its divisors is an integer number (352989009).

Almost surely, 2^1385808649 is an apocalyptic number.

It is an amenable number.

1385808649 is a deficient number, since it is larger than the sum of its proper divisors (26147387).

1385808649 is an equidigital number, since it uses as much as digits as its factorization.

1385808649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26147386.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The square root of 1385808649 is about 37226.4509320993. The cubic root of 1385808649 is about 1114.8961673438.

The spelling of 1385808649 in words is "one billion, three hundred eighty-five million, eight hundred eight thousand, six hundred forty-nine".