285736421 has 16 divisors (see below), whose sum is σ = 309288000. Its totient is φ = 263088000.

The previous prime is 285736397. The next prime is 285736439. The reversal of 285736421 is 124637582.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 285736421 - 2¹⁰ = 285735397 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285736721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271346 + ... + 272396.

It is an arithmetic number, because the mean of its divisors is an integer number (19330500).

Almost surely, 2^285736421 is an apocalyptic number.

It is an amenable number.

285736421 is a deficient number, since it is larger than the sum of its proper divisors (23551579).

285736421 is a wasteful number, since it uses less digits than its factorization.

285736421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460.

The product of its digits is 80640, while the sum is 38.

The square root of 285736421 is about 16903.7398524705. The cubic root of 285736421 is about 658.6507644566.

The spelling of 285736421 in words is "two hundred eighty-five million, seven hundred thirty-six thousand, four hundred twenty-one".