284891989 has 8 divisors (see below), whose sum is σ = 287115840. Its totient is φ = 282676800.

The previous prime is 284891987. The next prime is 284891993. The reversal of 284891989 is 989198482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 284891989 - 2¹ = 284891987 is a prime.

It is a super-2 number, since 2×284891989² = 162326890792752242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284891983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73869 + ... + 77629.

It is an arithmetic number, because the mean of its divisors is an integer number (35889480).

Almost surely, 2^284891989 is an apocalyptic number.

It is an amenable number.

284891989 is a deficient number, since it is larger than the sum of its proper divisors (2223851).

284891989 is a wasteful number, since it uses less digits than its factorization.

284891989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331.

The product of its digits is 2985984, while the sum is 58.

The square root of 284891989 is about 16878.7437032500. The cubic root of 284891989 is about 658.0012910979.

The spelling of 284891989 in words is "two hundred eighty-four million, eight hundred ninety-one thousand, nine hundred eighty-nine".