991444 has 12 divisors (see below), whose sum is σ = 1759968. Its totient is φ = 488600.

The previous prime is 991429. The next prime is 991447. The reversal of 991444 is 444199.

It is a super-2 number, since 2×991444² = 1965922410272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1462 + ... + 2029.

It is an arithmetic number, because the mean of its divisors is an integer number (146664).

2⁹⁹¹⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

991444 is a deficient number, since it is larger than the sum of its proper divisors (768524).

991444 is a wasteful number, since it uses less digits than its factorization.

991444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566 (or 3564 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 991444 is about 995.7128100010. The cubic root of 991444 is about 99.7139827211.

The spelling of 991444 in words is "nine hundred ninety-one thousand, four hundred forty-four".