391006 has 16 divisors (see below), whose sum is σ = 731520. Its totient is φ = 152280.

The previous prime is 390991. The next prime is 391009. The reversal of 391006 is 600193.

391006 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1116 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (45720).

2³⁹¹⁰⁰⁶ is an apocalyptic number.

391006 is a deficient number, since it is larger than the sum of its proper divisors (340514).

391006 is a wasteful number, since it uses less digits than its factorization.

391006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 391006 is about 625.3047257138. The cubic root of 391006 is about 73.1242021487.

Adding to 391006 its reverse (600193), we get a palindrome (991199).

The spelling of 391006 in words is "three hundred ninety-one thousand, six".