990518 has 16 divisors (see below), whose sum is σ = 1580256. Its totient is φ = 464640.

The previous prime is 990511. The next prime is 990523. The reversal of 990518 is 815099.

It is a super-2 number, since 2×990518² = 1962251816648, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990518.

It is not an unprimeable number, because it can be changed into a prime (990511) by changing a digit.

990518 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2630 + ... + 2982.

It is an arithmetic number, because the mean of its divisors is an integer number (98766).

2⁹⁹⁰⁵¹⁸ is an apocalyptic number.

990518 is a deficient number, since it is larger than the sum of its proper divisors (589738).

990518 is a wasteful number, since it uses less digits than its factorization.

990518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 990518 is about 995.2477078597. The cubic root of 990518 is about 99.6829290560.

The spelling of 990518 in words is "nine hundred ninety thousand, five hundred eighteen".