285689493 has 6 divisors (see below), whose sum is σ = 412662614. Its totient is φ = 190459656.

The previous prime is 285689489. The next prime is 285689501. The reversal of 285689493 is 394986582.

285689493 is a `hidden beast` number, since 28 + 56 + 89 + 493 = 666.

It can be written as a sum of positive squares in only one way, i.e., 269189649 + 16499844 = 16407^2 + 4062^2 .

It is not a de Polignac number, because 285689493 - 2² = 285689489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285689473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15871630 + ... + 15871647.

Almost surely, 2^285689493 is an apocalyptic number.

It is an amenable number.

285689493 is a deficient number, since it is larger than the sum of its proper divisors (126973121).

285689493 is a wasteful number, since it uses less digits than its factorization.

285689493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31743283 (or 31743280 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 285689493 is about 16902.3517002812. The cubic root of 285689493 is about 658.6147045857.

The spelling of 285689493 in words is "two hundred eighty-five million, six hundred eighty-nine thousand, four hundred ninety-three".