284840639 has 4 divisors (see below), whose sum is σ = 294662760. Its totient is φ = 275018520.

The previous prime is 284840623. The next prime is 284840657. The reversal of 284840639 is 936048482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936048482 = 2 ⋅468024241.

It is a cyclic number.

It is not a de Polignac number, because 284840639 - 2⁴ = 284840623 is a prime.

It is a super-2 number, since 2×284840639² = 162268379251856642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 284840639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284840669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4911017 + ... + 4911074.

It is an arithmetic number, because the mean of its divisors is an integer number (73665690).

Almost surely, 2^284840639 is an apocalyptic number.

284840639 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

284840639 is a deficient number, since it is larger than the sum of its proper divisors (9822121).

284840639 is an equidigital number, since it uses as much as digits as its factorization.

284840639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9822120.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 284840639 is about 16877.2224906825. Note that the first 3 decimals coincide. The cubic root of 284840639 is about 657.9617551827.

The spelling of 284840639 in words is "two hundred eighty-four million, eight hundred forty thousand, six hundred thirty-nine".