1284985 has 16 divisors (see below), whose sum is σ = 1696464. Its totient is φ = 928512.

The previous prime is 1284977. The next prime is 1284991. The reversal of 1284985 is 5894821.

It can be written as a sum of positive squares in 8 ways, for example, as 21609 + 1263376 = 147^2 + 1124^2 .

It is not a de Polignac number, because 1284985 - 2³ = 1284977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3259 + ... + 3631.

It is an arithmetic number, because the mean of its divisors is an integer number (106029).

2^1284985 is an apocalyptic number.

It is an amenable number.

1284985 is a deficient number, since it is larger than the sum of its proper divisors (411479).

1284985 is a wasteful number, since it uses less digits than its factorization.

1284985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444.

The product of its digits is 23040, while the sum is 37.

The square root of 1284985 is about 1133.5717886398. The cubic root of 1284985 is about 108.7174738681.

The spelling of 1284985 in words is "one million, two hundred eighty-four thousand, nine hundred eighty-five".