285979813 has 4 divisors (see below), whose sum is σ = 326834080. Its totient is φ = 245125548.

The previous prime is 285979801. The next prime is 285979829. The reversal of 285979813 is 318979582.

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 not a de Polignac number, because 285979813 - 2¹⁷ = 285848741 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 (285979843) 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 3 ways as a sum of consecutive naturals, for example, 20427123 + ... + 20427136.

It is an arithmetic number, because the mean of its divisors is an integer number (81708520).

Almost surely, 2^285979813 is an apocalyptic number.

It is an amenable number.

285979813 is a deficient number, since it is larger than the sum of its proper divisors (40854267).

285979813 is an equidigital number, since it uses as much as digits as its factorization.

285979813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40854266.

The product of its digits is 1088640, while the sum is 52.

The square root of 285979813 is about 16910.9376735887. The cubic root of 285979813 is about 658.8377256077.

The spelling of 285979813 in words is "two hundred eighty-five million, nine hundred seventy-nine thousand, eight hundred thirteen".