391612 has 24 divisors (see below), whose sum is σ = 783216. Its totient is φ = 169728.

The previous prime is 391579. The next prime is 391613. The reversal of 391612 is 216193.

391612 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 not an unprimeable number, because it can be changed into a prime (391613) by changing a digit.

391612 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 663 + ... + 1105.

It is an arithmetic number, because the mean of its divisors is an integer number (32634).

2³⁹¹⁶¹² is an apocalyptic number.

It is an amenable number.

391612 is a deficient number, since it is larger than the sum of its proper divisors (391604).

391612 is a wasteful number, since it uses less digits than its factorization.

391612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

The square root of 391612 is about 625.7891018546. The cubic root of 391612 is about 73.1619597904.

The spelling of 391612 in words is "three hundred ninety-one thousand, six hundred twelve".