285071993 has 4 divisors (see below), whose sum is σ = 287594868. Its totient is φ = 282549120.

The previous prime is 285071989. The next prime is 285072017. The reversal of 285071993 is 399170582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82664464 + 202407529 = 9092^2 + 14227^2 .

It is a cyclic number.

It is not a de Polignac number, because 285071993 - 2² = 285071989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285671993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1261268 + ... + 1261493.

It is an arithmetic number, because the mean of its divisors is an integer number (71898717).

Almost surely, 2^285071993 is an apocalyptic number.

It is an amenable number.

285071993 is a deficient number, since it is larger than the sum of its proper divisors (2522875).

285071993 is a wasteful number, since it uses less digits than its factorization.

285071993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522874.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 285071993 is about 16884.0751301337. The cubic root of 285071993 is about 658.1398441079.

The spelling of 285071993 in words is "two hundred eighty-five million, seventy-one thousand, nine hundred ninety-three".