990018 has 12 divisors (see below), whose sum is σ = 2145078. Its totient is φ = 330000.

The previous prime is 990013. The next prime is 990023. The reversal of 990018 is 810099.

990018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (990013) and next prime (990023).

It can be written as a sum of positive squares in only one way, i.e., 986049 + 3969 = 993^2 + 63^2 .

It is a junction number, because it is equal to n+sod(n) for n = 989973 and 990000.

It is not an unprimeable number, because it can be changed into a prime (990013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27483 + ... + 27518.

2⁹⁹⁰⁰¹⁸ is an apocalyptic number.

990018 is an abundant number, since it is smaller than the sum of its proper divisors (1155060).

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

990018 is a wasteful number, since it uses less digits than its factorization.

990018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55009 (or 55006 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 990018 is about 994.9964824058. The cubic root of 990018 is about 99.6661533712. Note that the first 3 decimals are identical.

The spelling of 990018 in words is "nine hundred ninety thousand, eighteen".