1818216 has 24 divisors (see below), whose sum is σ = 4924530. Its totient is φ = 606048.

The previous prime is 1818209. The next prime is 1818221. The reversal of 1818216 is 6128181.

It can be written as a sum of positive squares in only one way, i.e., 1102500 + 715716 = 1050^2 + 846^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1818216.

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, 12555 + ... + 12698.

2^1818216 is an apocalyptic number.

It is an amenable number.

1818216 is an abundant number, since it is smaller than the sum of its proper divisors (3106314).

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

1818216 is a wasteful number, since it uses less digits than its factorization.

1818216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25265 (or 25258 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1818216 is about 1348.4123998243. The cubic root of 1818216 is about 122.0530093030.

The spelling of 1818216 in words is "one million, eight hundred eighteen thousand, two hundred sixteen".