1385728 has 18 divisors (see below), whose sum is σ = 2766554. Its totient is φ = 692736.

The previous prime is 1385693. The next prime is 1385743. The reversal of 1385728 is 8275831.

It can be written as a sum of positive squares in only one way, i.e., 1016064 + 369664 = 1008^2 + 608^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1385693 and 1385702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2451 + ... + 2962.

2^1385728 is an apocalyptic number.

It is an amenable number.

1385728 is a deficient number, since it is larger than the sum of its proper divisors (1380826).

1385728 is an frugal number, since it uses more digits than its factorization.

1385728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5429 (or 5415 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 1385728 is about 1177.1694865227. The cubic root of 1385728 is about 111.4874539296.

The spelling of 1385728 in words is "one million, three hundred eighty-five thousand, seven hundred twenty-eight".