990240 has 48 divisors (see below), whose sum is σ = 3120768. Its totient is φ = 263936.

The previous prime is 990239. The next prime is 990259. The reversal of 990240 is 42099.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 990240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552 + ... + 1511.

It is an arithmetic number, because the mean of its divisors is an integer number (65016).

2⁹⁹⁰²⁴⁰ is an apocalyptic number.

It is an amenable number.

990240 is an abundant number, since it is smaller than the sum of its proper divisors (2130528).

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

990240 is a wasteful number, since it uses less digits than its factorization.

990240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081 (or 2073 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 990240 is about 995.1080343360. The cubic root of 990240 is about 99.6736024723.

The spelling of 990240 in words is "nine hundred ninety thousand, two hundred forty".