1293728 has 12 divisors (see below), whose sum is σ = 2547090. Its totient is φ = 646848.

The previous prime is 1293701. The next prime is 1293739. The reversal of 1293728 is 8273921.

It can be written as a sum of positive squares in only one way, i.e., 868624 + 425104 = 932^2 + 652^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 40429 = 1293728 / (1 + 2 + 9 + 3 + 7 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 1293694 and 1293703.

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, 20183 + ... + 20246.

2^1293728 is an apocalyptic number.

It is an amenable number.

1293728 is a deficient number, since it is larger than the sum of its proper divisors (1253362).

1293728 is an equidigital number, since it uses as much as digits as its factorization.

1293728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40439 (or 40431 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 1293728 is about 1137.4216456530. The cubic root of 1293728 is about 108.9634869144.

The spelling of 1293728 in words is "one million, two hundred ninety-three thousand, seven hundred twenty-eight".