1385323549 has 4 divisors (see below), whose sum is σ = 1422764764. Its totient is φ = 1347882336.

The previous prime is 1385323519. The next prime is 1385323571. The reversal of 1385323549 is 9453235831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9453235831 = 13 ⋅727171987.

It can be written as a sum of positive squares in 2 ways, for example, as 1332761049 + 52562500 = 36507^2 + 7250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385323549 - 2⁵ = 1385323517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385323519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18720552 + ... + 18720625.

It is an arithmetic number, because the mean of its divisors is an integer number (355691191).

Almost surely, 2^1385323549 is an apocalyptic number.

It is an amenable number.

1385323549 is a deficient number, since it is larger than the sum of its proper divisors (37441215).

1385323549 is an equidigital number, since it uses as much as digits as its factorization.

1385323549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37441214.

The product of its digits is 388800, while the sum is 43.

The square root of 1385323549 is about 37219.9348333658. The cubic root of 1385323549 is about 1114.7660629820.

It can be divided in two parts, 13853235 and 49, that added together give a square (13853284 = 3722²).

The spelling of 1385323549 in words is "one billion, three hundred eighty-five million, three hundred twenty-three thousand, five hundred forty-nine".