285234139 has 4 divisors (see below), whose sum is σ = 285489256. Its totient is φ = 284979024.

The previous prime is 285234113. The next prime is 285234167. The reversal of 285234139 is 931432582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285234139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 285234098 and 285234107.

It is not an unprimeable number, because it can be changed into a prime (285234199) 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, 125874 + ... + 128119.

It is an arithmetic number, because the mean of its divisors is an integer number (71372314).

Almost surely, 2^285234139 is an apocalyptic number.

285234139 is a deficient number, since it is larger than the sum of its proper divisors (255117).

285234139 is a wasteful number, since it uses less digits than its factorization.

285234139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255116.

The product of its digits is 51840, while the sum is 37.

The square root of 285234139 is about 16888.8761911502. The cubic root of 285234139 is about 658.2646015018.

The spelling of 285234139 in words is "two hundred eighty-five million, two hundred thirty-four thousand, one hundred thirty-nine".