1816825 has 6 divisors (see below), whose sum is σ = 2252894. Its totient is φ = 1453440.

The previous prime is 1816813. The next prime is 1816831. The reversal of 1816825 is 5286181.

It can be written as a sum of positive squares in 3 ways, for example, as 95481 + 1721344 = 309^2 + 1312^2 .

It is not a de Polignac number, because 1816825 - 2¹¹ = 1814777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36312 + ... + 36361.

2^1816825 is an apocalyptic number.

It is an amenable number.

1816825 is a deficient number, since it is larger than the sum of its proper divisors (436069).

1816825 is an equidigital number, since it uses as much as digits as its factorization.

1816825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72683 (or 72678 counting only the distinct ones).

The product of its digits is 3840, while the sum is 31.

The square root of 1816825 is about 1347.8965093804. The cubic root of 1816825 is about 122.0218763959.

The spelling of 1816825 in words is "one million, eight hundred sixteen thousand, eight hundred twenty-five".