285938 has 4 divisors (see below), whose sum is σ = 428910. Its totient is φ = 142968.

The previous prime is 285937. The next prime is 285949. The reversal of 285938 is 839582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 839582 = 2 ⋅419791.

It can be written as a sum of positive squares in only one way, i.e., 284089 + 1849 = 533^2 + 43^2 .

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 285898 and 285907.

It is not an unprimeable number, because it can be changed into a prime (285937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71483 + ... + 71486.

2²⁸⁵⁹³⁸ is an apocalyptic number.

285938 is a deficient number, since it is larger than the sum of its proper divisors (142972).

285938 is a wasteful number, since it uses less digits than its factorization.

285938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142971.

The product of its digits is 17280, while the sum is 35.

The square root of 285938 is about 534.7317084296. The cubic root of 285938 is about 65.8805614571.

The spelling of 285938 in words is "two hundred eighty-five thousand, nine hundred thirty-eight".