991488 has 36 divisors (see below), whose sum is σ = 2640848. Its totient is φ = 330240.

The previous prime is 991483. The next prime is 991493. The reversal of 991488 is 884199.

It is an interprime number because it is at equal distance from previous prime (991483) and next prime (991493).

Its product of digits (20736) is a multiple of the sum of its prime divisors (1296).

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991488.

It is not an unprimeable number, because it can be changed into a prime (991483) 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, 123 + ... + 1413.

2⁹⁹¹⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1320424).

991488 is an abundant number, since it is smaller than the sum of its proper divisors (1649360).

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

991488 is a wasteful number, since it uses less digits than its factorization.

991488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310 (or 1296 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 991488 is about 995.7349044801. The cubic root of 991488 is about 99.7154577919.

The spelling of 991488 in words is "nine hundred ninety-one thousand, four hundred eighty-eight".