381285 has 24 divisors (see below), whose sum is σ = 681720. Its totient is φ = 196992.

The previous prime is 381253. The next prime is 381287. The reversal of 381285 is 582183.

It is a happy number.

381285 is a `hidden beast` number, since 381 + 285 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 199809 + 181476 = 447^2 + 426^2 .

It is not a de Polignac number, because 381285 - 2⁵ = 381253 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381285.

It is not an unprimeable number, because it can be changed into a prime (381287) 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, 1551 + ... + 1779.

It is an arithmetic number, because the mean of its divisors is an integer number (28405).

2³⁸¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

381285 is a deficient number, since it is larger than the sum of its proper divisors (300435).

381285 is a wasteful number, since it uses less digits than its factorization.

381285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 274 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 381285 is about 617.4827932825. The cubic root of 381285 is about 72.5131169291.

It can be divided in two parts, 381 and 285, that added together give a palindrome (666).

The spelling of 381285 in words is "three hundred eighty-one thousand, two hundred eighty-five".