390028 has 12 divisors (see below), whose sum is σ = 686952. Its totient is φ = 193760.

The previous prime is 390001. The next prime is 390043. The reversal of 390028 is 820093.

It is a junction number, because it is equal to n+sod(n) for n = 389990 and 390008.

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, 951 + ... + 1297.

It is an arithmetic number, because the mean of its divisors is an integer number (57246).

2³⁹⁰⁰²⁸ is an apocalyptic number.

It is an amenable number.

390028 is a deficient number, since it is larger than the sum of its proper divisors (296924).

390028 is a wasteful number, since it uses less digits than its factorization.

390028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 390028 is about 624.5222173790. The cubic root of 390028 is about 73.0631841776.

Adding to 390028 its reverse (820093), we get a palindrome (1210121).

The spelling of 390028 in words is "three hundred ninety thousand, twenty-eight".