391224 has 16 divisors (see below), whose sum is σ = 978120. Its totient is φ = 130400.

The previous prime is 391219. The next prime is 391231. The reversal of 391224 is 422193.

It is a self number, because there is not a number n which added to its sum of digits gives 391224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8127 + ... + 8174.

2³⁹¹²²⁴ is an apocalyptic number.

It is an amenable number.

391224 is an abundant number, since it is smaller than the sum of its proper divisors (586896).

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

391224 is a wasteful number, since it uses less digits than its factorization.

391224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16310 (or 16306 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 391224 is about 625.4790164346. The cubic root of 391224 is about 73.1377894206.

The spelling of 391224 in words is "three hundred ninety-one thousand, two hundred twenty-four".