440991 has 8 divisors (see below), whose sum is σ = 653360. Its totient is φ = 293976.

The previous prime is 440989. The next prime is 441011. The reversal of 440991 is 199044.

It is not a de Polignac number, because 440991 - 2¹ = 440989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 16333 = 440991 / (4 + 4 + 0 + 9 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440911) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8140 + ... + 8193.

It is an arithmetic number, because the mean of its divisors is an integer number (81670).

2⁴⁴⁰⁹⁹¹ is an apocalyptic number.

440991 is a deficient number, since it is larger than the sum of its proper divisors (212369).

440991 is a wasteful number, since it uses less digits than its factorization.

440991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16342 (or 16336 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 440991 is about 664.0715322915. The cubic root of 440991 is about 76.1161083065.

It can be divided in two parts, 44099 and 1, that added together give a square (44100 = 210²).

The spelling of 440991 in words is "four hundred forty thousand, nine hundred ninety-one".