285221469 has 24 divisors (see below), whose sum is σ = 413035392. Its totient is φ = 174994560.

The previous prime is 285221441. The next prime is 285221473. The reversal of 285221469 is 964122582.

It is not a de Polignac number, because 285221469 - 2⁷ = 285221341 is a prime.

It is a super-2 number, since 2×285221469² = 162702572757035922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285221269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 231084 + ... + 232314.

It is an arithmetic number, because the mean of its divisors is an integer number (17209808).

Almost surely, 2^285221469 is an apocalyptic number.

It is an amenable number.

285221469 is a deficient number, since it is larger than the sum of its proper divisors (127813923).

285221469 is a wasteful number, since it uses less digits than its factorization.

285221469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717 (or 1704 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 285221469 is about 16888.5010880184. The cubic root of 285221469 is about 658.2548547303.

The spelling of 285221469 in words is "two hundred eighty-five million, two hundred twenty-one thousand, four hundred sixty-nine".