391669446 has 48 divisors (see below), whose sum is σ = 917449200. Its totient is φ = 111142080.

The previous prime is 391669427. The next prime is 391669459. The reversal of 391669446 is 644966193.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 391669395 and 391669404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39336 + ... + 48276.

It is an arithmetic number, because the mean of its divisors is an integer number (19113525).

Almost surely, 2^391669446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391669446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (458724600).

391669446 is an abundant number, since it is smaller than the sum of its proper divisors (525779754).

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

391669446 is a wasteful number, since it uses less digits than its factorization.

391669446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9109 (or 9102 counting only the distinct ones).

The product of its digits is 839808, while the sum is 48.

The square root of 391669446 is about 19790.6403635658. The cubic root of 391669446 is about 731.6553701854.

The spelling of 391669446 in words is "three hundred ninety-one million, six hundred sixty-nine thousand, four hundred forty-six".