385581 has 24 divisors (see below), whose sum is σ = 621984. Its totient is φ = 211680.

The previous prime is 385579. The next prime is 385589. The reversal of 385581 is 185583.

It is a happy number.

It is not a de Polignac number, because 385581 - 2¹ = 385579 is a prime.

It is a super-2 number, since 2×385581² = 297345415122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385589) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6291 + ... + 6351.

It is an arithmetic number, because the mean of its divisors is an integer number (25916).

2³⁸⁵⁵⁸¹ is an apocalyptic number.

It is an amenable number.

385581 is a deficient number, since it is larger than the sum of its proper divisors (236403).

385581 is a wasteful number, since it uses less digits than its factorization.

385581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 114 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 385581 is about 620.9516889421. The cubic root of 385581 is about 72.7844394751.

The spelling of 385581 in words is "three hundred eighty-five thousand, five hundred eighty-one".