285479917 has 4 divisors (see below), whose sum is σ = 286760320. Its totient is φ = 284199516.

The previous prime is 285479903. The next prime is 285479947. The reversal of 285479917 is 719974582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285479917 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 (285479947) 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, 639867 + ... + 640312.

It is an arithmetic number, because the mean of its divisors is an integer number (71690080).

Almost surely, 2^285479917 is an apocalyptic number.

It is an amenable number.

285479917 is a deficient number, since it is larger than the sum of its proper divisors (1280403).

285479917 is a wasteful number, since it uses less digits than its factorization.

285479917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280402.

The product of its digits is 1270080, while the sum is 52.

The square root of 285479917 is about 16896.1509522139. The cubic root of 285479917 is about 658.4536164061.

The spelling of 285479917 in words is "two hundred eighty-five million, four hundred seventy-nine thousand, nine hundred seventeen".