386728 has 8 divisors (see below), whose sum is σ = 725130. Its totient is φ = 193360.

The previous prime is 386723. The next prime is 386731. The reversal of 386728 is 827683.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 272484 + 114244 = 522^2 + 338^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 386693 and 386702.

It is not an unprimeable number, because it can be changed into a prime (386723) by changing a digit.

386728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24163 + ... + 24178.

2³⁸⁶⁷²⁸ is an apocalyptic number.

It is an amenable number.

386728 is a deficient number, since it is larger than the sum of its proper divisors (338402).

386728 is a wasteful number, since it uses less digits than its factorization.

386728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48347 (or 48343 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 386728 is about 621.8745854270. The cubic root of 386728 is about 72.8565394212.

The spelling of 386728 in words is "three hundred eighty-six thousand, seven hundred twenty-eight".