284128989 has 4 divisors (see below), whose sum is σ = 378838656. Its totient is φ = 189419324.

The previous prime is 284128969. The next prime is 284128991. The reversal of 284128989 is 989821482.

It is a happy number.

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 284128989 - 2⁷ = 284128861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284128969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47354829 + ... + 47354834.

It is an arithmetic number, because the mean of its divisors is an integer number (94709664).

Almost surely, 2^284128989 is an apocalyptic number.

It is an amenable number.

284128989 is a deficient number, since it is larger than the sum of its proper divisors (94709667).

284128989 is an equidigital number, since it uses as much as digits as its factorization.

284128989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94709666.

The product of its digits is 663552, while the sum is 51.

The square root of 284128989 is about 16856.1261563860. The cubic root of 284128989 is about 657.4133444665.

It can be divided in two parts, 28412 and 8989, that added together give a triangular number (37401 = T₂₇₃).

The spelling of 284128989 in words is "two hundred eighty-four million, one hundred twenty-eight thousand, nine hundred eighty-nine".