285397819 has 8 divisors (see below), whose sum is σ = 345355488. Its totient is φ = 230236800.

The previous prime is 285397817. The next prime is 285397831. The reversal of 285397819 is 918793582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 285397819 - 2¹ = 285397817 is a prime.

It is a super-4 number, since 4×285397819⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285397817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1199032 + ... + 1199269.

It is an arithmetic number, because the mean of its divisors is an integer number (43169436).

Almost surely, 2^285397819 is an apocalyptic number.

285397819 is a deficient number, since it is larger than the sum of its proper divisors (59957669).

285397819 is a wasteful number, since it uses less digits than its factorization.

285397819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398325.

The product of its digits is 1088640, while the sum is 52.

The square root of 285397819 is about 16893.7212892838. The cubic root of 285397819 is about 658.3904912327.

The spelling of 285397819 in words is "two hundred eighty-five million, three hundred ninety-seven thousand, eight hundred nineteen".