1809018 has 12 divisors (see below), whose sum is σ = 3919578. Its totient is φ = 603000.

The previous prime is 1808993. The next prime is 1809029. The reversal of 1809018 is 8109081.

It can be written as a sum of positive squares in only one way, i.e., 1734489 + 74529 = 1317^2 + 273^2 .

It is a super-2 number, since 2×1809018² = 6545092248648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1808982 and 1809000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50233 + ... + 50268.

2^1809018 is an apocalyptic number.

1809018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1809018 is an abundant number, since it is smaller than the sum of its proper divisors (2110560).

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

1809018 is a wasteful number, since it uses less digits than its factorization.

1809018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100509 (or 100506 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1809018 is about 1344.9973977670. The cubic root of 1809018 is about 121.8468471462.

The spelling of 1809018 in words is "one million, eight hundred nine thousand, eighteen".