285683809 has 4 divisors (see below), whose sum is σ = 287601300. Its totient is φ = 283766320.

The previous prime is 285683773. The next prime is 285683819. The reversal of 285683809 is 908386582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 125104225 + 160579584 = 11185^2 + 12672^2 .

It is a cyclic number.

It is not a de Polignac number, because 285683809 - 2¹⁷ = 285552737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285683819) 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, 958522 + ... + 958819.

It is an arithmetic number, because the mean of its divisors is an integer number (71900325).

Almost surely, 2^285683809 is an apocalyptic number.

It is an amenable number.

285683809 is a deficient number, since it is larger than the sum of its proper divisors (1917491).

285683809 is a wasteful number, since it uses less digits than its factorization.

285683809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917490.

The product of its (nonzero) digits is 829440, while the sum is 49.

The square root of 285683809 is about 16902.1835571621. The cubic root of 285683809 is about 658.6103366840.

The spelling of 285683809 in words is "two hundred eighty-five million, six hundred eighty-three thousand, eight hundred nine".