391244 has 24 divisors (see below), whose sum is σ = 796320. Its totient is φ = 164736.

The previous prime is 391231. The next prime is 391247. The reversal of 391244 is 442193.

It is not an unprimeable number, because it can be changed into a prime (391247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2414 + ... + 2570.

It is an arithmetic number, because the mean of its divisors is an integer number (33180).

2³⁹¹²⁴⁴ is an apocalyptic number.

It is an amenable number.

391244 is an abundant number, since it is smaller than the sum of its proper divisors (405076).

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

391244 is a wasteful number, since it uses less digits than its factorization.

391244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 255 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 391244 is about 625.4950039769. The cubic root of 391244 is about 73.1390357065.

It can be divided in two parts, 39 and 1244, that multiplied together give a triangular number (48516 = T₃₁₁).

The spelling of 391244 in words is "three hundred ninety-one thousand, two hundred forty-four".