385409 has 4 divisors (see below), whose sum is σ = 394416. Its totient is φ = 376404.

The previous prime is 385403. The next prime is 385417. The reversal of 385409 is 904583.

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: 904583 = 41 ⋅22063.

It is a cyclic number.

It is not a de Polignac number, because 385409 - 2⁴ = 385393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385403) 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, 4439 + ... + 4524.

It is an arithmetic number, because the mean of its divisors is an integer number (98604).

2³⁸⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

385409 is a deficient number, since it is larger than the sum of its proper divisors (9007).

385409 is an equidigital number, since it uses as much as digits as its factorization.

385409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9006.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 385409 is about 620.8131764066. The cubic root of 385409 is about 72.7736153028.

The spelling of 385409 in words is "three hundred eighty-five thousand, four hundred nine".