390863 has 4 divisors (see below), whose sum is σ = 426408. Its totient is φ = 355320.

The previous prime is 390851. The next prime is 390869. The reversal of 390863 is 368093.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 390863 - 2¹⁰ = 389839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17756 + ... + 17777.

It is an arithmetic number, because the mean of its divisors is an integer number (106602).

2³⁹⁰⁸⁶³ is an apocalyptic number.

390863 is a deficient number, since it is larger than the sum of its proper divisors (35545).

390863 is a wasteful number, since it uses less digits than its factorization.

390863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35544.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 390863 is about 625.1903710071. The cubic root of 390863 is about 73.1152866539.

The spelling of 390863 in words is "three hundred ninety thousand, eight hundred sixty-three".