390278 has 16 divisors (see below), whose sum is σ = 681504. Its totient is φ = 164160.

The previous prime is 390263. The next prime is 390281. The reversal of 390278 is 872093.

390278 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 390278.

It is a congruent number.

It is an unprimeable number.

390278 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 in 7 ways as a sum of consecutive naturals, for example, 626 + ... + 1082.

It is an arithmetic number, because the mean of its divisors is an integer number (42594).

2³⁹⁰²⁷⁸ is an apocalyptic number.

390278 is a deficient number, since it is larger than the sum of its proper divisors (291226).

390278 is a wasteful number, since it uses less digits than its factorization.

390278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 390278 is about 624.7223383232. The cubic root of 390278 is about 73.0787915141.

The spelling of 390278 in words is "three hundred ninety thousand, two hundred seventy-eight".