991480 has 32 divisors (see below), whose sum is σ = 2550240. Its totient is φ = 339840.

The previous prime is 991453. The next prime is 991483. The reversal of 991480 is 84199.

991480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1491 + ... + 2050.

It is an arithmetic number, because the mean of its divisors is an integer number (79695).

2⁹⁹¹⁴⁸⁰ is an apocalyptic number.

It is an amenable number.

991480 is an abundant number, since it is smaller than the sum of its proper divisors (1558760).

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

991480 is a wasteful number, since it uses less digits than its factorization.

991480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559 (or 3555 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 991480 is about 995.7308873385. The cubic root of 991480 is about 99.7151896005.

The spelling of 991480 in words is "nine hundred ninety-one thousand, four hundred eighty".