285855947 has 4 divisors (see below), whose sum is σ = 307844880. Its totient is φ = 263867016.

The previous prime is 285855919. The next prime is 285855971. The reversal of 285855947 is 749558582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749558582 = 2 ⋅374779291.

It is a cyclic number.

It is not a de Polignac number, because 285855947 - 2¹⁰ = 285854923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285855907) 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, 10994447 + ... + 10994472.

It is an arithmetic number, because the mean of its divisors is an integer number (76961220).

Almost surely, 2^285855947 is an apocalyptic number.

285855947 is a deficient number, since it is larger than the sum of its proper divisors (21988933).

285855947 is a wasteful number, since it uses less digits than its factorization.

285855947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21988932.

The product of its digits is 4032000, while the sum is 53.

The square root of 285855947 is about 16907.2749726264. The cubic root of 285855947 is about 658.7425914117.

The spelling of 285855947 in words is "two hundred eighty-five million, eight hundred fifty-five thousand, nine hundred forty-seven".