391606 has 8 divisors (see below), whose sum is σ = 593424. Its totient is φ = 193800.

The previous prime is 391579. The next prime is 391613. The reversal of 391606 is 606193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (74178).

2³⁹¹⁶⁰⁶ is an apocalyptic number.

391606 is a deficient number, since it is larger than the sum of its proper divisors (201818).

391606 is a wasteful number, since it uses less digits than its factorization.

391606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 391606 is about 625.7843078889. The cubic root of 391606 is about 73.1615861433.

Adding to 391606 its reverse (606193), we get a palindrome (997799).

The spelling of 391606 in words is "three hundred ninety-one thousand, six hundred six".