285721343 has 4 divisors (see below), whose sum is σ = 289635408. Its totient is φ = 281807280.

The previous prime is 285721339. The next prime is 285721379. The reversal of 285721343 is 343127582.

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

It is a cyclic number.

It is not a de Polignac number, because 285721343 - 2² = 285721339 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 (285721313) 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, 1956923 + ... + 1957068.

It is an arithmetic number, because the mean of its divisors is an integer number (72408852).

Almost surely, 2^285721343 is an apocalyptic number.

285721343 is a deficient number, since it is larger than the sum of its proper divisors (3914065).

285721343 is an equidigital number, since it uses as much as digits as its factorization.

285721343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914064.

The product of its digits is 40320, while the sum is 35.

The square root of 285721343 is about 16903.2938506079. The cubic root of 285721343 is about 658.6391788247.

The spelling of 285721343 in words is "two hundred eighty-five million, seven hundred twenty-one thousand, three hundred forty-three".