391446 has 32 divisors (see below), whose sum is σ = 950400. Its totient is φ = 118440.

The previous prime is 391441. The next prime is 391451. The reversal of 391446 is 644193.

It is an interprime number because it is at equal distance from previous prime (391441) and next prime (391451).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (29700).

2³⁹¹⁴⁴⁶ is an apocalyptic number.

391446 is the 396-th heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475200).

391446 is an abundant number, since it is smaller than the sum of its proper divisors (558954).

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

391446 is a wasteful number, since it uses less digits than its factorization.

391446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 675 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 391446 is about 625.6564552532. The cubic root of 391446 is about 73.1516208139.

It can be divided in two parts, 39 and 1446, that added together give a triangular number (1485 = T₅₄).

The spelling of 391446 in words is "three hundred ninety-one thousand, four hundred forty-six".