1816506 has 20 divisors (see below), whose sum is σ = 4070682. Its totient is φ = 605448.

The previous prime is 1816489. The next prime is 1816511. The reversal of 1816506 is 6056181.

1816506 is a `hidden beast` number, since 1 + 8 + 1 + 650 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1798281 + 18225 = 1341^2 + 135^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1816506.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5445 + ... + 5768.

2^1816506 is an apocalyptic number.

1816506 is an abundant number, since it is smaller than the sum of its proper divisors (2254176).

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

1816506 is a wasteful number, since it uses less digits than its factorization.

1816506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11227 (or 11218 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1816506 is about 1347.7781716588. The cubic root of 1816506 is about 122.0147344024.

The spelling of 1816506 in words is "one million, eight hundred sixteen thousand, five hundred six".