285855801 has 16 divisors (see below), whose sum is σ = 475189248. Its totient is φ = 148496400.

The previous prime is 285855793. The next prime is 285855811. The reversal of 285855801 is 108558582.

It is not a de Polignac number, because 285855801 - 2³ = 285855793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (285855811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 618505 + ... + 618966.

It is an arithmetic number, because the mean of its divisors is an integer number (29699328).

Almost surely, 2^285855801 is an apocalyptic number.

285855801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

285855801 is a deficient number, since it is larger than the sum of its proper divisors (189333447).

285855801 is a wasteful number, since it uses less digits than its factorization.

285855801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237492.

The product of its (nonzero) digits is 128000, while the sum is 42.

The square root of 285855801 is about 16907.2706549579. The cubic root of 285855801 is about 658.7424792615.

It can be divided in two parts, 285 and 855801, that added together give a triangular number (856086 = T₁₃₀₈).

The spelling of 285855801 in words is "two hundred eighty-five million, eight hundred fifty-five thousand, eight hundred one".