391216 has 30 divisors (see below), whose sum is σ = 883500. Its totient is φ = 167328.

The previous prime is 391199. The next prime is 391217. The reversal of 391216 is 612193.

It is not an unprimeable number, because it can be changed into a prime (391217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 535 + ... + 1033.

It is an arithmetic number, because the mean of its divisors is an integer number (29450).

2³⁹¹²¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (441750).

391216 is an abundant number, since it is smaller than the sum of its proper divisors (492284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391216 is a wasteful number, since it uses less digits than its factorization.

391216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 508 counting only the distinct ones).

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

The square root of 391216 is about 625.4726213033. The cubic root of 391216 is about 73.1372908943.

It can be divided in two parts, 3 and 91216, that added together give a palindrome (91219).

The spelling of 391216 in words is "three hundred ninety-one thousand, two hundred sixteen".