1284945 has 16 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 644864.

The previous prime is 1284937. The next prime is 1284967. The reversal of 1284945 is 5494821.

It is a cyclic number.

It is not a de Polignac number, because 1284945 - 2³ = 1284937 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2265 + ... + 2774.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

2^1284945 is an apocalyptic number.

1284945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1284945 is a deficient number, since it is larger than the sum of its proper divisors (892335).

1284945 is a wasteful number, since it uses less digits than its factorization.

1284945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064.

The product of its digits is 11520, while the sum is 33.

The square root of 1284945 is about 1133.5541451558. The cubic root of 1284945 is about 108.7163457760.

The spelling of 1284945 in words is "one million, two hundred eighty-four thousand, nine hundred forty-five".