1385209 has 4 divisors (see below), whose sum is σ = 1583104. Its totient is φ = 1187316.

The previous prime is 1385203. The next prime is 1385213. The reversal of 1385209 is 9025831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9025831 = 1907 ⋅4733.

It is a cyclic number.

It is not a de Polignac number, because 1385209 - 2⁹ = 1384697 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 (1385203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98937 + ... + 98950.

It is an arithmetic number, because the mean of its divisors is an integer number (395776).

2^1385209 is an apocalyptic number.

It is an amenable number.

1385209 is a deficient number, since it is larger than the sum of its proper divisors (197895).

1385209 is an equidigital number, since it uses as much as digits as its factorization.

1385209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197894.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1385209 is about 1176.9490218357. The cubic root of 1385209 is about 111.4735336380.

The spelling of 1385209 in words is "one million, three hundred eighty-five thousand, two hundred nine".