285811438 has 12 divisors (see below), whose sum is σ = 471234960. Its totient is φ = 129914180.

The previous prime is 285811417. The next prime is 285811439. The reversal of 285811438 is 834118582.

It is a self number, because there is not a number n which added to its sum of digits gives 285811438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285811439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 590278 + ... + 590761.

It is an arithmetic number, because the mean of its divisors is an integer number (39269580).

Almost surely, 2^285811438 is an apocalyptic number.

285811438 is a deficient number, since it is larger than the sum of its proper divisors (185423522).

285811438 is a wasteful number, since it uses less digits than its factorization.

285811438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181063 (or 1181052 counting only the distinct ones).

The product of its digits is 61440, while the sum is 40.

The square root of 285811438 is about 16905.9586536818. The cubic root of 285811438 is about 658.7083999525.

The spelling of 285811438 in words is "two hundred eighty-five million, eight hundred eleven thousand, four hundred thirty-eight".