285981693 has 16 divisors (see below), whose sum is σ = 389995776. Its totient is φ = 186338880.

The previous prime is 285981679. The next prime is 285981697. The reversal of 285981693 is 396189582.

It is a happy number.

It is not a de Polignac number, because 285981693 - 2¹² = 285977597 is a prime.

It is a super-2 number, since 2×285981693² = 163571057462292498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285981697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39771 + ... + 46407.

It is an arithmetic number, because the mean of its divisors is an integer number (24374736).

Almost surely, 2^285981693 is an apocalyptic number.

It is an amenable number.

285981693 is a deficient number, since it is larger than the sum of its proper divisors (104014083).

285981693 is a wasteful number, since it uses less digits than its factorization.

285981693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6964.

The product of its digits is 933120, while the sum is 51.

The square root of 285981693 is about 16910.9932588243. The cubic root of 285981693 is about 658.8391693136.

The spelling of 285981693 in words is "two hundred eighty-five million, nine hundred eighty-one thousand, six hundred ninety-three".