391144 has 16 divisors (see below), whose sum is σ = 790020. Its totient is φ = 180480.

The previous prime is 391133. The next prime is 391151. The reversal of 391144 is 441193.

It can be written as a sum of positive squares in 2 ways, for example, as 372100 + 19044 = 610^2 + 138^2 .

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, 1777 + ... + 1984.

2³⁹¹¹⁴⁴ is an apocalyptic number.

It is an amenable number.

391144 is an abundant number, since it is smaller than the sum of its proper divisors (398876).

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

391144 is a wasteful number, since it uses less digits than its factorization.

391144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780 (or 3776 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 391144 is about 625.4150621787. The cubic root of 391144 is about 73.1328038522.

It can be divided in two parts, 391 and 144, that added together give a palindrome (535).

The spelling of 391144 in words is "three hundred ninety-one thousand, one hundred forty-four".