285939381289 has 9 divisors (see below), whose sum is σ = 288086184477. Its totient is φ = 283808470284.

The previous prime is 285939381271. The next prime is 285939381359. The reversal of 285939381289 is 982183939582.

It is a happy number.

The square root of 285939381289 is 534733.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 285939381289 - 2¹⁷ = 285939250217 is a prime.

It is a super-2 number, since 2×285939381289² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285939381229) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 74325964 + ... + 74329810.

It is an arithmetic number, because the mean of its divisors is an integer number (32009576053).

Almost surely, 2^285939381289 is an apocalyptic number.

285939381289 is the 534733-rd square number.

285939381289 is the 267367-th centered octagonal number.

It is an amenable number.

285939381289 is a deficient number, since it is larger than the sum of its proper divisors (2146803188).

285939381289 is an frugal number, since it uses more digits than its factorization.

285939381289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7972 (or 3986 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 67.

The spelling of 285939381289 in words is "two hundred eighty-five billion, nine hundred thirty-nine million, three hundred eighty-one thousand, two hundred eighty-nine".