385309 has 4 divisors (see below), whose sum is σ = 386716. Its totient is φ = 383904.

The previous prime is 385291. The next prime is 385321. The reversal of 385309 is 903583.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 308025 + 77284 = 555^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 385309 - 2¹¹ = 383261 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 (385379) 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, 144 + ... + 889.

It is an arithmetic number, because the mean of its divisors is an integer number (96679).

2³⁸⁵³⁰⁹ is an apocalyptic number.

It is an amenable number.

385309 is a deficient number, since it is larger than the sum of its proper divisors (1407).

385309 is a wasteful number, since it uses less digits than its factorization.

385309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 385309 is about 620.7326316539. The cubic root of 385309 is about 72.7673206988.

The spelling of 385309 in words is "three hundred eighty-five thousand, three hundred nine".