285972813 has 12 divisors (see below), whose sum is σ = 472082208. Its totient is φ = 163413000.

The previous prime is 285972809. The next prime is 285972839. The reversal of 285972813 is 318279582.

It is a happy number.

285972813 is a `hidden beast` number, since 28 + 597 + 28 + 13 = 666.

It is not a de Polignac number, because 285972813 - 2² = 285972809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285972803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2269563 + ... + 2269688.

It is an arithmetic number, because the mean of its divisors is an integer number (39340184).

Almost surely, 2^285972813 is an apocalyptic number.

It is an amenable number.

285972813 is a deficient number, since it is larger than the sum of its proper divisors (186109395).

285972813 is a wasteful number, since it uses less digits than its factorization.

285972813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539264 (or 4539261 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 285972813 is about 16910.7307056792. The cubic root of 285972813 is about 658.8323500515.

The spelling of 285972813 in words is "two hundred eighty-five million, nine hundred seventy-two thousand, eight hundred thirteen".