1278764 has 6 divisors (see below), whose sum is σ = 2237844. Its totient is φ = 639380.

The previous prime is 1278733. The next prime is 1278769. The reversal of 1278764 is 4678721.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1278769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159842 + ... + 159849.

It is an arithmetic number, because the mean of its divisors is an integer number (372974).

2^1278764 is an apocalyptic number.

It is an amenable number.

1278764 is a deficient number, since it is larger than the sum of its proper divisors (959080).

1278764 is a wasteful number, since it uses less digits than its factorization.

1278764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319695 (or 319693 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 1278764 is about 1130.8244779806. The cubic root of 1278764 is about 108.5417452820.

The spelling of 1278764 in words is "one million, two hundred seventy-eight thousand, seven hundred sixty-four".