390856 has 8 divisors (see below), whose sum is σ = 732870. Its totient is φ = 195424.

The previous prime is 390851. The next prime is 390869. The reversal of 390856 is 658093.

It can be written as a sum of positive squares in only one way, i.e., 202500 + 188356 = 450^2 + 434^2 .

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

It is not an unprimeable number, because it can be changed into a prime (390851) by changing a digit.

390856 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 as a sum of consecutive naturals, namely, 24421 + ... + 24436.

2³⁹⁰⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

390856 is a deficient number, since it is larger than the sum of its proper divisors (342014).

390856 is a wasteful number, since it uses less digits than its factorization.

390856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48863 (or 48859 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 390856 is about 625.1847726872. The cubic root of 390856 is about 73.1148501753.

The spelling of 390856 in words is "three hundred ninety thousand, eight hundred fifty-six".