1278716 has 6 divisors (see below), whose sum is σ = 2237760. Its totient is φ = 639356.

The previous prime is 1278713. The next prime is 1278721. The reversal of 1278716 is 6178721.

It is a super-2 number, since 2×1278716² = 3270229217312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278713) by changing a digit.

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, 159836 + ... + 159843.

It is an arithmetic number, because the mean of its divisors is an integer number (372960).

2^1278716 is an apocalyptic number.

It is an amenable number.

1278716 is a deficient number, since it is larger than the sum of its proper divisors (959044).

1278716 is a wasteful number, since it uses less digits than its factorization.

1278716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319683 (or 319681 counting only the distinct ones).

The product of its digits is 4704, while the sum is 32.

The square root of 1278716 is about 1130.8032543285. The cubic root of 1278716 is about 108.5403871818.

The spelling of 1278716 in words is "one million, two hundred seventy-eight thousand, seven hundred sixteen".