991448 has 8 divisors (see below), whose sum is σ = 1858980. Its totient is φ = 495720.

The previous prime is 991447. The next prime is 991453. The reversal of 991448 is 844199.

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

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 as a sum of consecutive naturals, namely, 61958 + ... + 61973.

2⁹⁹¹⁴⁴⁸ is an apocalyptic number.

It is an amenable number.

991448 is a deficient number, since it is larger than the sum of its proper divisors (867532).

991448 is a wasteful number, since it uses less digits than its factorization.

991448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123937 (or 123933 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 991448 is about 995.7148186102. The cubic root of 991448 is about 99.7141168202.

The spelling of 991448 in words is "nine hundred ninety-one thousand, four hundred forty-eight".