1277728 has 12 divisors (see below), whose sum is σ = 2515590. Its totient is φ = 638848.

The previous prime is 1277723. The next prime is 1277729. The reversal of 1277728 is 8277721.

It can be written as a sum of positive squares in only one way, i.e., 1192464 + 85264 = 1092^2 + 292^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1277693 and 1277702.

It is not an unprimeable number, because it can be changed into a prime (1277723) 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, 19933 + ... + 19996.

2^1277728 is an apocalyptic number.

It is an amenable number.

1277728 is a deficient number, since it is larger than the sum of its proper divisors (1237862).

1277728 is an equidigital number, since it uses as much as digits as its factorization.

1277728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39939 (or 39931 counting only the distinct ones).

The product of its digits is 10976, while the sum is 34.

The square root of 1277728 is about 1130.3663123077. The cubic root of 1277728 is about 108.5124254000.

It can be divided in two parts, 1 and 277728, that added together give a square (277729 = 527²).

The spelling of 1277728 in words is "one million, two hundred seventy-seven thousand, seven hundred twenty-eight".