1280978 has 8 divisors (see below), whose sum is σ = 1929420. Its totient is φ = 637840.

The previous prime is 1280969. The next prime is 1280987. The reversal of 1280978 is 8790821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1280969) and next prime (1280987).

It can be written as a sum of positive squares in 2 ways, for example, as 822649 + 458329 = 907^2 + 677^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 653 + ... + 1728.

2^1280978 is an apocalyptic number.

1280978 is a deficient number, since it is larger than the sum of its proper divisors (648442).

1280978 is a wasteful number, since it uses less digits than its factorization.

1280978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1280978 is about 1131.8029863894. The cubic root of 1280978 is about 108.6043507533.

The spelling of 1280978 in words is "one million, two hundred eighty thousand, nine hundred seventy-eight".