391828 has 12 divisors (see below), whose sum is σ = 715680. Its totient is φ = 187352.

The previous prime is 391823. The next prime is 391847. The reversal of 391828 is 828193.

It is a self number, because there is not a number n which added to its sum of digits gives 391828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391823) by changing a digit.

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, 2038 + ... + 2221.

It is an arithmetic number, because the mean of its divisors is an integer number (59640).

2³⁹¹⁸²⁸ is an apocalyptic number.

It is an amenable number.

391828 is a deficient number, since it is larger than the sum of its proper divisors (323852).

391828 is a wasteful number, since it uses less digits than its factorization.

391828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286 (or 4284 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 391828 is about 625.9616601678. The cubic root of 391828 is about 73.1754085430.

The spelling of 391828 in words is "three hundred ninety-one thousand, eight hundred twenty-eight".