390428 has 6 divisors (see below), whose sum is σ = 683256. Its totient is φ = 195212.

The previous prime is 390421. The next prime is 390433. The reversal of 390428 is 824093.

It is a junction number, because it is equal to n+sod(n) for n = 390397 and 390406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390421) 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 as a sum of consecutive naturals, namely, 48800 + ... + 48807.

It is an arithmetic number, because the mean of its divisors is an integer number (113876).

2³⁹⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

390428 is a deficient number, since it is larger than the sum of its proper divisors (292828).

390428 is a wasteful number, since it uses less digits than its factorization.

390428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97611 (or 97609 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 390428 is about 624.8423801248. The cubic root of 390428 is about 73.0881527171.

It can be divided in two parts, 390 and 428, that added together give a palindrome (818).

The spelling of 390428 in words is "three hundred ninety thousand, four hundred twenty-eight".