391016 has 16 divisors (see below), whose sum is σ = 753540. Its totient is φ = 190080.

The previous prime is 391009. The next prime is 391019. The reversal of 391016 is 610193.

391016 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 306916 + 84100 = 554^2 + 290^2 .

It is an Ulam number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (391019) by changing a digit.

391016 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365 + ... + 956.

2³⁹¹⁰¹⁶ is an apocalyptic number.

It is an amenable number.

391016 is a deficient number, since it is larger than the sum of its proper divisors (362524).

391016 is a wasteful number, since it uses less digits than its factorization.

391016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364 (or 1360 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 391016 is about 625.3127217641. The cubic root of 391016 is about 73.1248255286.

It can be divided in two parts, 3 and 91016, that added together give a palindrome (91019).

The spelling of 391016 in words is "three hundred ninety-one thousand, sixteen".