1284865 has 8 divisors (see below), whose sum is σ = 1548648. Its totient is φ = 1023360.

The previous prime is 1284863. The next prime is 1284889. The reversal of 1284865 is 5684821.

It can be written as a sum of positive squares in 4 ways, for example, as 28224 + 1256641 = 168^2 + 1121^2 .

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

It is not a de Polignac number, because 1284865 - 2¹ = 1284863 is a prime.

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 1284865.

It is not an unprimeable number, because it can be changed into a prime (1284863) 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, 1155 + ... + 1975.

It is an arithmetic number, because the mean of its divisors is an integer number (193581).

2^1284865 is an apocalyptic number.

It is an amenable number.

1284865 is a deficient number, since it is larger than the sum of its proper divisors (263783).

1284865 is an equidigital number, since it uses as much as digits as its factorization.

1284865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139.

The product of its digits is 15360, while the sum is 34.

The square root of 1284865 is about 1133.5188573641. The cubic root of 1284865 is about 108.7140895217.

The spelling of 1284865 in words is "one million, two hundred eighty-four thousand, eight hundred sixty-five".