1287278 has 4 divisors (see below), whose sum is σ = 1930920. Its totient is φ = 643638.

The previous prime is 1287239. The next prime is 1287289. The reversal of 1287278 is 8727821.

It is a semiprime because it is the product of two primes.

It is a congruent 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 as a sum of consecutive naturals, namely, 321818 + ... + 321821.

It is an arithmetic number, because the mean of its divisors is an integer number (482730).

2^1287278 is an apocalyptic number.

1287278 is a deficient number, since it is larger than the sum of its proper divisors (643642).

1287278 is an equidigital number, since it uses as much as digits as its factorization.

1287278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643641.

The product of its digits is 12544, while the sum is 35.

The square root of 1287278 is about 1134.5827426856. The cubic root of 1287278 is about 108.7821026465.

The spelling of 1287278 in words is "one million, two hundred eighty-seven thousand, two hundred seventy-eight".