391648 has 12 divisors (see below), whose sum is σ = 771120. Its totient is φ = 195808.

The previous prime is 391639. The next prime is 391661. The reversal of 391648 is 846193.

391648 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable 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, 6088 + ... + 6151.

It is an arithmetic number, because the mean of its divisors is an integer number (64260).

2³⁹¹⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

391648 is a deficient number, since it is larger than the sum of its proper divisors (379472).

391648 is a wasteful number, since it uses less digits than its factorization.

391648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12249 (or 12241 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 391648 is about 625.8178648776. The cubic root of 391648 is about 73.1642015925.

The spelling of 391648 in words is "three hundred ninety-one thousand, six hundred forty-eight".