1385305309 has 8 divisors (see below), whose sum is σ = 1410294240. Its totient is φ = 1360366800.

The previous prime is 1385305297. The next prime is 1385305343. The reversal of 1385305309 is 9035035831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1385305309 - 2¹⁷ = 1385174237 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 (1385305609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45199 + ... + 69379.

It is an arithmetic number, because the mean of its divisors is an integer number (176286780).

Almost surely, 2^1385305309 is an apocalyptic number.

It is an amenable number.

1385305309 is a deficient number, since it is larger than the sum of its proper divisors (24988931).

1385305309 is an equidigital number, since it uses as much as digits as its factorization.

1385305309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25211.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 1385305309 is about 37219.6898025763. The cubic root of 1385305309 is about 1114.7611704012.

The spelling of 1385305309 in words is "one billion, three hundred eighty-five million, three hundred five thousand, three hundred nine".