1816243 has 12 divisors (see below), whose sum is σ = 2147688. Its totient is φ = 1522560.

The previous prime is 1816237. The next prime is 1816247. The reversal of 1816243 is 3426181.

It is not a de Polignac number, because 1816243 - 2⁵ = 1816211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1816247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1371 + ... + 2347.

It is an arithmetic number, because the mean of its divisors is an integer number (178974).

2^1816243 is an apocalyptic number.

1816243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1816243 is a deficient number, since it is larger than the sum of its proper divisors (331445).

1816243 is a wasteful number, since it uses less digits than its factorization.

1816243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014 (or 1001 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 1816243 is about 1347.6806001423. The cubic root of 1816243 is about 122.0088455469.

It can be divided in two parts, 18 and 16243, that added together give a palindrome (16261).

The spelling of 1816243 in words is "one million, eight hundred sixteen thousand, two hundred forty-three".