1239728 has 20 divisors (see below), whose sum is σ = 2745360. Its totient is φ = 531264.

The previous prime is 1239727. The next prime is 1239737. The reversal of 1239728 is 8279321.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1239694 and 1239703.

It is not an unprimeable number, because it can be changed into a prime (1239727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5423 + ... + 5646.

It is an arithmetic number, because the mean of its divisors is an integer number (137268).

2^1239728 is an apocalyptic number.

It is an amenable number.

1239728 is an abundant number, since it is smaller than the sum of its proper divisors (1505632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1239728 is a wasteful number, since it uses less digits than its factorization.

1239728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11084 (or 11078 counting only the distinct ones).

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

The square root of 1239728 is about 1113.4307342624. The cubic root of 1239728 is about 107.4258511566.

The spelling of 1239728 in words is "one million, two hundred thirty-nine thousand, seven hundred twenty-eight".