1278985 has 8 divisors (see below), whose sum is σ = 1615680. Its totient is φ = 969264.

The previous prime is 1278983. The next prime is 1278997. The reversal of 1278985 is 5898721.

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 1278985 - 2¹ = 1278983 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1278983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6637 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (201960).

2^1278985 is an apocalyptic number.

It is an amenable number.

1278985 is a deficient number, since it is larger than the sum of its proper divisors (336695).

1278985 is a wasteful number, since it uses less digits than its factorization.

1278985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13487.

The product of its digits is 40320, while the sum is 40.

The square root of 1278985 is about 1130.9221900732. The cubic root of 1278985 is about 108.5479977633.

The spelling of 1278985 in words is "one million, two hundred seventy-eight thousand, nine hundred eighty-five".