1242728 has 16 divisors (see below), whose sum is σ = 2405760. Its totient is φ = 601200.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242728 is 8272421.

It is a junction number, because it is equal to n+sod(n) for n = 1242697 and 1242706.

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 in 3 ways as a sum of consecutive naturals, for example, 2258 + ... + 2753.

It is an arithmetic number, because the mean of its divisors is an integer number (150360).

2^1242728 is an apocalyptic number.

It is an amenable number.

1242728 is a deficient number, since it is larger than the sum of its proper divisors (1163032).

1242728 is a wasteful number, since it uses less digits than its factorization.

1242728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5048 (or 5044 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 1242728 is about 1114.7771077664. Note that the first 3 decimals coincide. The cubic root of 1242728 is about 107.5124341125.

The spelling of 1242728 in words is "one million, two hundred forty-two thousand, seven hundred twenty-eight".