285716986 has 4 divisors (see below), whose sum is σ = 428575482. Its totient is φ = 142858492.

The previous prime is 285716969. The next prime is 285716989. The reversal of 285716986 is 689617582.

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

It can be written as a sum of positive squares in only one way, i.e., 185096025 + 100620961 = 13605^2 + 10031^2 .

It is not an unprimeable number, because it can be changed into a prime (285716989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71429245 + ... + 71429248.

Almost surely, 2^285716986 is an apocalyptic number.

285716986 is a deficient number, since it is larger than the sum of its proper divisors (142858496).

285716986 is a wasteful number, since it uses less digits than its factorization.

285716986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142858495.

The product of its digits is 1451520, while the sum is 52.

The square root of 285716986 is about 16903.1649699102. The cubic root of 285716986 is about 658.6358309177.

The spelling of 285716986 in words is "two hundred eighty-five million, seven hundred sixteen thousand, nine hundred eighty-six".